diff --git a/.gitignore b/.gitignore
index 8adf1ca..0897e1f 100755
--- a/.gitignore
+++ b/.gitignore
@@ -2,8 +2,7 @@
 logs
 
 # Specific
-Specific/config.php
-Specific/config.system.php
+config/baikal.yaml
 Specific/INSTALL_DISABLED
 
 # Composer stuff
@@ -15,3 +14,9 @@ vendor
 
 # Vim
 .*.swp
+
+# Others
+.DS_Store
+
+# IDE
+nbproject
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 49a44d5..6500a53 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,12 @@
 ChangeLog
 =========
 
+0.7.0 (2019-10-14)
+------------------
+
+* Changed to YAML configuration files
+* Minor configuration improvements
+
 0.6.1 (2019-11-13)
 ------------------
 
diff --git a/Core/Distrib.php b/Core/Distrib.php
index 3b49278..125aeff 100644
--- a/Core/Distrib.php
+++ b/Core/Distrib.php
@@ -24,5 +24,5 @@
 #  This copyright notice MUST APPEAR in all copies of the script!
 #################################################################
 
-define("BAIKAL_VERSION", "0.6.1");
+define("BAIKAL_VERSION", "0.7.0");
 define("BAIKAL_HOMEPAGE", "http://sabre.io/baikal/");
diff --git a/Core/Frameworks/Baikal/Core/Server.php b/Core/Frameworks/Baikal/Core/Server.php
index 09aaee5..46a8f0c 100644
--- a/Core/Frameworks/Baikal/Core/Server.php
+++ b/Core/Frameworks/Baikal/Core/Server.php
@@ -28,6 +28,7 @@
 namespace Baikal\Core;
 
 use PDO;
+use Symfony\Component\Yaml\Yaml;
 
 /**
  * The Baikal Server
@@ -131,6 +132,12 @@ class Server {
      */
     protected function initServer() {
 
+        try {
+            $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+        } catch (\Exception $e) {
+            error_log('Error reading baikal.yaml file : ' . $e->getMessage());
+        }
+
         if ($this->authType === 'Basic') {
             $authBackend = new \Baikal\Core\PDOBasicAuth($this->pdo, $this->authRealm);
         } else {
@@ -171,8 +178,8 @@ class Server {
             $this->server->addPlugin(new \Sabre\CalDAV\Schedule\Plugin());
             $this->server->addPlugin(new \Sabre\DAV\Sharing\Plugin());
             $this->server->addPlugin(new \Sabre\CalDAV\SharingPlugin());
-            if (defined("BAIKAL_INVITE_FROM") && BAIKAL_INVITE_FROM !== "") {
-                $this->server->addPlugin(new \Sabre\CalDAV\Schedule\IMipPlugin(BAIKAL_INVITE_FROM));
+            if (isset($config['system']["invite_from"]) && $config['system']["invite_from"] !== "") {
+                $this->server->addPlugin(new \Sabre\CalDAV\Schedule\IMipPlugin($config['system']["invite_from"]));
             }
         }
         if ($this->enableCardDAV) {
diff --git a/Core/Frameworks/Baikal/Core/Tools.php b/Core/Frameworks/Baikal/Core/Tools.php
index 9c1caae..cc4a610 100644
--- a/Core/Frameworks/Baikal/Core/Tools.php
+++ b/Core/Frameworks/Baikal/Core/Tools.php
@@ -73,33 +73,18 @@ class Tools {
         #}
 
         # Asserting config file exists
-        if (!file_exists(PROJECT_PATH_SPECIFIC . "config.php")) {
-            throw new \Exception("Specific/config.php does not exist. Please use the Install tool to create it.");
+        if (!file_exists(PROJECT_PATH_CONFIG . "baikal.yaml")) {
+            throw new \Exception("config/baikal.yaml does not exist. Please use the Install tool to create it or duplicate baikal.yaml.dist.");
         }
 
         # Asserting config file is readable
-        if (!is_readable(PROJECT_PATH_SPECIFIC . "config.php")) {
-            throw new \Exception("Specific/config.php is not readable. Please give read permissions to httpd user on file 'Specific/config.php'.");
+        if (!is_readable(PROJECT_PATH_CONFIG . "baikal.yaml")) {
+            throw new \Exception("config/baikal.yaml is not readable. Please give read permissions to httpd user on file 'config/baikal.yaml'.");
         }
 
         # Asserting config file is writable
-        if (!is_writable(PROJECT_PATH_SPECIFIC . "config.php")) {
-            throw new \Exception("Specific/config.php is not writable. Please give write permissions to httpd user on file 'Specific/config.php'.");
-        }
-
-        # Asserting system config file exists
-        if (!file_exists(PROJECT_PATH_SPECIFIC . "config.system.php")) {
-            throw new \Exception("Specific/config.system.php does not exist. Please use the Install tool to create it.");
-        }
-
-        # Asserting system config file is readable
-        if (!is_readable(PROJECT_PATH_SPECIFIC . "config.system.php")) {
-            throw new \Exception("Specific/config.system.php is not readable. Please give read permissions to httpd user on file 'Specific/config.system.php'.");
-        }
-
-        # Asserting system config file is writable
-        if (!is_writable(PROJECT_PATH_SPECIFIC . "config.system.php")) {
-            throw new \Exception("Specific/config.system.php is not writable. Please give write permissions to httpd user on file 'Specific/config.system.php'.");
+        if (!is_writable(PROJECT_PATH_CONFIG . "baikal.yaml")) {
+            throw new \Exception("config/baikal.yaml is not writable. Please give write permissions to httpd user on file 'config/baikal.yaml'.");
         }
     }
 
diff --git a/Core/Frameworks/Baikal/Framework.php b/Core/Frameworks/Baikal/Framework.php
index c1622be..5fd7ca3 100644
--- a/Core/Frameworks/Baikal/Framework.php
+++ b/Core/Frameworks/Baikal/Framework.php
@@ -27,6 +27,8 @@
 
 namespace Baikal;
 
+use Symfony\Component\Yaml\Yaml;
+
 class Framework extends \Flake\Core\Framework {
 
     static function installTool() {
@@ -50,30 +52,24 @@ class Framework extends \Flake\Core\Framework {
         \Baikal\Core\Tools::configureEnvironment();
 
         # Check that a config file exists
-        if (
-            !file_exists(PROJECT_PATH_SPECIFIC . "config.php") ||
-            !file_exists(PROJECT_PATH_SPECIFIC . "config.system.php")
-        ) {
+        if (!file_exists(PROJECT_PATH_CONFIG . "baikal.yaml")) {
             self::installTool();
         } else {
-            require_once(PROJECT_PATH_SPECIFIC . "config.php");
-            require_once(PROJECT_PATH_SPECIFIC . "config.system.php");
-            date_default_timezone_set(PROJECT_TIMEZONE);
+            $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+            date_default_timezone_set($config['system']['timezone']);
 
             # Check that Baïkal is already configured
-            if (!defined("BAIKAL_CONFIGURED_VERSION")) {
+            if (!isset($config['system']['configured_version'])) {
                 self::installTool();
-
             } else {
 
                 # Check that running version matches configured version
-                if (version_compare(BAIKAL_VERSION, BAIKAL_CONFIGURED_VERSION) > 0) {
+                if (version_compare(BAIKAL_VERSION, $config['system']['configured_version']) > 0) {
                     self::installTool();
-
                 } else {
 
                     # Check that admin password is set
-                    if (!defined("BAIKAL_ADMIN_PASSWORDHASH")) {
+                    if (!$config['system']['admin_passwordhash']) {
                         self::installTool();
                     }
 
diff --git a/Core/Frameworks/Baikal/Model/Calendar.php b/Core/Frameworks/Baikal/Model/Calendar.php
index 064c062..8ddca09 100644
--- a/Core/Frameworks/Baikal/Model/Calendar.php
+++ b/Core/Frameworks/Baikal/Model/Calendar.php
@@ -27,6 +27,8 @@
 
 namespace Baikal\Model;
 
+use Symfony\Component\Yaml\Yaml;
+
 class Calendar extends \Flake\Core\Model\Db {
     const DATATABLE = "calendarinstances";
     const PRIMARYKEY = "id";
@@ -39,11 +41,21 @@ class Calendar extends \Flake\Core\Model\Db {
         "description"   => "",
         "calendarorder" => 0,
         "calendarcolor" => "",
-        "timezone"      => PROJECT_TIMEZONE,
+        "timezone"      => null,
         "calendarid"    => 0
     ];
     protected $oCalendar; # Baikal\Model\Calendar\Calendar
 
+    function __construct($sPrimary = false) {
+        parent::__construct($sPrimary);
+        try {
+            $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+            $this->set("timezone", $config['system']["timezone"]);
+        } catch (\Exception $e) {
+            error_log('Error reading baikal.yaml file : ' . $e->getMessage());
+        }
+    }
+
     protected function initFloating() {
         parent::initFloating();
         $this->oCalendar = new Calendar\Calendar();
diff --git a/Core/Frameworks/Baikal/Model/Config.php b/Core/Frameworks/Baikal/Model/Config.php
index 483f9e9..978ee9a 100644
--- a/Core/Frameworks/Baikal/Model/Config.php
+++ b/Core/Frameworks/Baikal/Model/Config.php
@@ -27,106 +27,44 @@
 
 namespace Baikal\Model;
 
+use Symfony\Component\Yaml\Yaml;
+
 abstract class Config extends \Flake\Core\Model\NoDb {
 
-    protected $sConfigFilePath = "";
-    protected $aConstants = [];
+    protected $sConfigFileSection = "";
     protected $aData = [];
 
-    function __construct($sConfigFilePath) {
+    function __construct($sConfigFileSection) {
         # Note: no call to parent::__construct() to avoid erasing $this->aData
-        $this->sConfigFilePath = $sConfigFilePath;
-        $aConfig = $this->parseConfig(
-            $this->getConfigAsString()
-        );
+        $this->sConfigFileSection = $sConfigFileSection;
 
-        foreach (array_keys($this->aData) as $sProp) {
-            if (array_key_exists($sProp, $aConfig)) {
-                $this->aData[$sProp] = $aConfig[$sProp];
+        try {
+            $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+            $aConfig = $config[$sConfigFileSection];
+            foreach (array_keys($this->aData) as $sProp) {
+                if (array_key_exists($sProp, $aConfig)) {
+                    $this->aData[$sProp] = $aConfig[$sProp];
+                }
             }
+        } catch (\Exception $e) {
+            error_log('Error reading baikal.yaml file : ' . $e->getMessage());
+            // Keep default values in $aData
         }
     }
 
     protected function getConfigAsString() {
-        if (file_exists($this->sConfigFilePath)) {
-            $sContent = file_get_contents($this->sConfigFilePath);
-            return str_replace(LF . CR, LF, $sContent);
+        if (file_exists(PROJECT_PATH_CONFIG . "baikal.yaml")) {
+            return Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml")[$this->sConfigFileSection];
         } else {
-
-            $sConfig = "<?php\n" . \Baikal\Core\Tools::getCopyrightNotice() . "\n\n";
-            $sConfig .= static::getDefaultConfig();
-
-            return $sConfig;
+            return $this->aData;
         }
     }
 
-    protected function parseConfig($sString) {
-
-        $aRes = [];
-
-        foreach (array_keys($this->aConstants) as $sConstant) {
-            $aConstant = $this->aConstants[$sConstant];
-
-            $aMatches = [];
-            $sPattern = '/\s*define\(\s*["|\']' . $sConstant . '["|\']\s*\,\s*(.*?)\s*\);\s*/ix';
-
-            $iNbRes = preg_match_all(
-                $sPattern,
-                $sString,
-                $aMatches
-            );
-
-            if ($iNbRes === 1) {
-                # Exactly one match
-                # O would be not enough, and > 1, to much to handle properly
-
-                $sValue = $aMatches[1][0];    # first capture (.*?), first occurence (anyway, we asserted that there's only one)
-                switch ($aConstant["type"]) {
-                    case "string": {
-                        $sValue = substr($sValue, 1, -1);    # Strip quotes
-                        break;
-                    }
-                    case "integer": {
-                        $sValue = intval($sValue);    # Integer
-                        break;
-                    }
-                    case "boolean": {
-                        if (in_array(strtoupper(trim($sValue)), ["1", "TRUE"])) {
-                            $sValue = true;
-                        } else {
-                            $sValue = false;
-                        }
-                        break;
-                    }
-                    case "litteral": {
-                        $sValue = trim($sValue);
-                        break;
-                    }
-                    default: {
-                        # nothing
-                        break;
-                    }
-                }
-
-                $aRes[$sConstant] = $sValue;
-
-            } elseif ($iNbRes > 1) {
-                throw new \Exception("Baikal\Model\Config->parseConfig(): constant '" . $sConstant . "' has been found multiple times in the config file; stopping execution");
-            } else {
-                # $iNbRes === 0
-                # We do nothing, to keep the default value (the one already set in $aData)
-            }
-        }
-
-        reset($aRes);
-        return $aRes;
-    }
-
     function writable() {
         return (
-            @file_exists($this->sConfigFilePath) &&
-            @is_file($this->sConfigFilePath) &&
-            @is_writable($this->sConfigFilePath)
+            @file_exists(PROJECT_PATH_CONFIG . "baikal.yaml") &&
+            @is_file(PROJECT_PATH_CONFIG . "baikal.yaml") &&
+            @is_writable(PROJECT_PATH_CONFIG . "baikal.yaml")
         );
     }
 
@@ -147,95 +85,18 @@ abstract class Config extends \Flake\Core\Model\NoDb {
     }
 
     function persist() {
-        $aLines = explode(LF, $this->getConfigAsString());
-        $iLines = count($aLines);
-
-        foreach (array_keys($this->aData) as $prop) {
-            $sPattern = '/\s*define\(\s*["|\']' . $prop . '["|\']\s*\,\s*(.*?)\s*\);\s*/ix';
-            $sValue = $this->aData[$prop];
-
-
-            # We replace value by it's native PHP notation
-            switch ($this->aConstants[$prop]["type"]) {
-                case "string": {
-                    $sValue = var_export($sValue, true);    # Add quotes, and escape " and all string-termination chars
-                    break;
-                }
-                case "integer": {
-                    $sValue = intval($sValue);    # Cast as integer
-                    break;
-                }
-                case "boolean": {
-
-                    if (intval($sValue) === 1) {    # Note as a BOOLEAN PHP constant
-                        $sValue = "TRUE";
-                    } else {
-                        $sValue = "FALSE";
-                    }
-
-                    break;
-                }
-                case "litteral": {
-                    $sValue = trim($sValue);
-                    break;
-                }
-                default: {
-                    $sValue = "''";
-                    break;
-                }
-            }
-
-            $mFound = false;
-            for ($k = ($iLines - 1); $k >= 0; $k--) {
-                if (preg_match($sPattern, $aLines[$k])) {
-
-                    # Found the last matching line
-                    $mFound = $k;
-                    break;
-                }
-            }
-
-            if ($mFound === false) {
-                # Adding line at the end of the file
-                $aLines[] = "\n" . "# " . $this->aConstants[$prop]["comment"] . "\ndefine(\"" . $prop . "\", " . $sValue . ");";
-            } else {
-                $aLines[$mFound] = "define(\"" . $prop . "\", " . $sValue . ");";
-            }
+        if (file_exists(PROJECT_PATH_CONFIG . "baikal.yaml")) {
+            $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+        } else {
+            $config = [];
+                    
         }
-
-        $sLines = implode("\n", $aLines);
-        $sSandboxedCode = str_replace(["<?php", "<?", "?>"], "", $sLines);
-        $sRand = (string)rand();
-        $sCode = "if(0) {" . $sSandboxedCode . "\n}; echo '" . $sRand . "';";
-        ob_start();
-        eval($sCode);
-        $sRes = ob_get_contents();
-        ob_end_clean();
-
-        if ($sRes !== $sRand) {
-            echo "<pre>" . htmlspecialchars($sLines) . "</pre>";
-            throw new \Exception("Parse error in new config file. Aborting, nothing has been changed.");
-        }
-
-        # We asserted that the syntax is OK;
-        # We now check that all the constants are present, and with the right value
-        $aNewConfig = $this->parseConfig($sLines);
-        $aWrittenConfig = $this->aData;
-
-        asort($aNewConfig);
-        asort($aWrittenConfig);
-
-        if ($aNewConfig != $aWrittenConfig) {
-            throw new \Exception("New config does not correspond to expected config. Aborting, nothing has been changed.");
-        }
-
-        file_put_contents($this->sConfigFilePath, $sLines);
+        $config[$this->sConfigFileSection] = $this->aData;
+        $yaml = Yaml::dump($config);
+        file_put_contents(PROJECT_PATH_CONFIG . "baikal.yaml", $yaml);
     }
 
     function destroy() {
 
     }
-
-    protected static function getDefaultConfig() {
-    }
 }
diff --git a/Core/Frameworks/Baikal/Model/Config/Database.php b/Core/Frameworks/Baikal/Model/Config/Database.php
index 8a9bb47..0eb0404 100644
--- a/Core/Frameworks/Baikal/Model/Config/Database.php
+++ b/Core/Frameworks/Baikal/Model/Config/Database.php
@@ -30,27 +30,27 @@ namespace Baikal\Model\Config;
 class Database extends \Baikal\Model\Config {
 
     protected $aConstants = [
-        "PROJECT_SQLITE_FILE" => [
+        "sqlite_file" => [
             "type"    => "litteral",
             "comment" => "Define path to Baïkal Database SQLite file",
         ],
-        "PROJECT_DB_MYSQL" => [
+        "mysql" => [
             "type"    => "boolean",
             "comment" => "MySQL > Use MySQL instead of SQLite ?",
         ],
-        "PROJECT_DB_MYSQL_HOST" => [
+        "mysql_host" => [
             "type"    => "string",
             "comment" => "MySQL > Host, including ':portnumber' if port is not the default one (3306)",
         ],
-        "PROJECT_DB_MYSQL_DBNAME" => [
+        "mysql_dbname" => [
             "type"    => "string",
             "comment" => "MySQL > Database name",
         ],
-        "PROJECT_DB_MYSQL_USERNAME" => [
+        "mysql_username" => [
             "type"    => "string",
             "comment" => "MySQL > Username",
         ],
-        "PROJECT_DB_MYSQL_PASSWORD" => [
+        "mysql_password" => [
             "type"    => "string",
             "comment" => "MySQL > Password",
         ],
@@ -58,19 +58,23 @@ class Database extends \Baikal\Model\Config {
 
     # Default values
     protected $aData = [
-        "PROJECT_SQLITE_FILE"       => 'PROJECT_PATH_SPECIFIC . "db/db.sqlite"',
-        "PROJECT_DB_MYSQL"          => false,
-        "PROJECT_DB_MYSQL_HOST"     => "",
-        "PROJECT_DB_MYSQL_DBNAME"   => "",
-        "PROJECT_DB_MYSQL_USERNAME" => "",
-        "PROJECT_DB_MYSQL_PASSWORD" => "",
+        "sqlite_file"    => PROJECT_PATH_SPECIFIC . "db/db.sqlite",
+        "mysql"          => false,
+        "mysql_host"     => "",
+        "mysql_dbname"   => "",
+        "mysql_username" => "",
+        "mysql_password" => "",
     ];
 
+    function __construct() {
+        parent::__construct("database");
+    }
+
     function formMorphologyForThisModelInstance() {
         $oMorpho = new \Formal\Form\Morphology();
 
         $oMorpho->add(new \Formal\Element\Text([
-            "prop"       => "PROJECT_SQLITE_FILE",
+            "prop"       => "sqlite_file",
             "label"      => "SQLite file path",
             "validation" => "required",
             "inputclass" => "input-xxlarge",
@@ -78,30 +82,30 @@ class Database extends \Baikal\Model\Config {
         ]));
 
         $oMorpho->add(new \Formal\Element\Checkbox([
-            "prop"            => "PROJECT_DB_MYSQL",
+            "prop"            => "mysql",
             "label"           => "Use MySQL",
             "help"            => "If checked, Baïkal will use MySQL instead of SQLite.",
             "refreshonchange" => true,
         ]));
 
         $oMorpho->add(new \Formal\Element\Text([
-            "prop"  => "PROJECT_DB_MYSQL_HOST",
+            "prop"  => "mysql_host",
             "label" => "MySQL host",
             "help"  => "Host ip or name, including <strong>':portnumber'</strong> if port is not the default one (3306)"
         ]));
 
         $oMorpho->add(new \Formal\Element\Text([
-            "prop"  => "PROJECT_DB_MYSQL_DBNAME",
+            "prop"  => "mysql_dbname",
             "label" => "MySQL database name",
         ]));
 
         $oMorpho->add(new \Formal\Element\Text([
-            "prop"  => "PROJECT_DB_MYSQL_USERNAME",
+            "prop"  => "mysql_username",
             "label" => "MySQL username",
         ]));
 
         $oMorpho->add(new \Formal\Element\Password([
-            "prop"  => "PROJECT_DB_MYSQL_PASSWORD",
+            "prop"  => "mysql_password",
             "label" => "MySQL password",
         ]));
 
@@ -111,8 +115,4 @@ class Database extends \Baikal\Model\Config {
     function label() {
         return "Baïkal Database Settings";
     }
-
-    protected static function getDefaultConfig() {
-        throw new \Exception("Should never reach getDefaultConfig() on \Baikal\Model\Config\Database");
-    }
 }
diff --git a/Core/Frameworks/Baikal/Model/Config/Standard.php b/Core/Frameworks/Baikal/Model/Config/Standard.php
index daab958..5507870 100644
--- a/Core/Frameworks/Baikal/Model/Config/Standard.php
+++ b/Core/Frameworks/Baikal/Model/Config/Standard.php
@@ -27,30 +27,32 @@
 
 namespace Baikal\Model\Config;
 
+use Symfony\Component\Yaml\Yaml;
+
 class Standard extends \Baikal\Model\Config {
 
     protected $aConstants = [
-        "PROJECT_TIMEZONE" => [
+        "timezone" => [
             "type"    => "string",
             "comment" => "Timezone of the server; if unsure, check http://en.wikipedia.org/wiki/List_of_tz_database_time_zones",
         ],
-        "BAIKAL_CARD_ENABLED" => [
+        "card_enabled" => [
             "type"    => "boolean",
             "comment" => "CardDAV ON/OFF switch; default TRUE",
         ],
-        "BAIKAL_CAL_ENABLED" => [
+        "cal_enabled" => [
             "type"    => "boolean",
             "comment" => "CalDAV ON/OFF switch; default TRUE",
         ],
-        "BAIKAL_INVITE_FROM" => [
+        "invite_from" => [
             "type"    => "string",
             "comment" => "CalDAV invite From: mail address (comment or leave blank to disable notifications)",
         ],
-        "BAIKAL_DAV_AUTH_TYPE" => [
+        "dav_auth_type" => [
             "type"    => "string",
             "comment" => "HTTP authentication type for WebDAV; default Digest"
         ],
-        "BAIKAL_ADMIN_PASSWORDHASH" => [
+        "admin_passwordhash" => [
             "type"    => "string",
             "comment" => "Baïkal Web admin password hash; Set via Baïkal Web Admin",
         ]
@@ -58,19 +60,25 @@ class Standard extends \Baikal\Model\Config {
 
     # Default values
     protected $aData = [
-        "PROJECT_TIMEZONE"          => "Europe/Paris",
-        "BAIKAL_CARD_ENABLED"       => true,
-        "BAIKAL_CAL_ENABLED"        => true,
-        "BAIKAL_INVITE_FROM"        => "",
-        "BAIKAL_DAV_AUTH_TYPE"      => "Digest",
-        "BAIKAL_ADMIN_PASSWORDHASH" => ""
-    ];
+        "configured_version" => BAIKAL_VERSION,
+        "timezone"           => "Europe/Paris",
+        "card_enabled"       => true,
+        "cal_enabled"        => true,
+        "dav_auth_type"      => "Digest",
+        "admin_passwordhash" => "",
+        "auth_realm"         => "BaikalDAV"
+];
+
+    function __construct() {
+        $this->aData["invite_from"] = "noreply@" . $_SERVER['SERVER_NAME']; // Default value
+        parent::__construct("system");
+    }
 
     function formMorphologyForThisModelInstance() {
         $oMorpho = new \Formal\Form\Morphology();
 
         $oMorpho->add(new \Formal\Element\Listbox([
-            "prop"       => "PROJECT_TIMEZONE",
+            "prop"       => "timezone",
             "label"      => "Server Time zone",
             "validation" => "required",
             "options"    => \Baikal\Core\Tools::timezones(),
@@ -78,46 +86,52 @@ class Standard extends \Baikal\Model\Config {
 
 
         $oMorpho->add(new \Formal\Element\Checkbox([
-            "prop"  => "BAIKAL_CARD_ENABLED",
+            "prop"  => "card_enabled",
             "label" => "Enable CardDAV"
         ]));
 
         $oMorpho->add(new \Formal\Element\Checkbox([
-            "prop"  => "BAIKAL_CAL_ENABLED",
+            "prop"  => "cal_enabled",
             "label" => "Enable CalDAV"
         ]));
 
         $oMorpho->add(new \Formal\Element\Text([
-            "prop"  => "BAIKAL_INVITE_FROM",
+            "prop"  => "invite_from",
             "label" => "Email invite sender address",
             "help"  => "Leave empty to disable sending invite emails"
         ]));
 
         $oMorpho->add(new \Formal\Element\Listbox([
-            "prop"    => "BAIKAL_DAV_AUTH_TYPE",
+            "prop"    => "dav_auth_type",
             "label"   => "WebDAV authentication type",
             "options" => ["Digest", "Basic"]
         ]));
 
         $oMorpho->add(new \Formal\Element\Password([
-            "prop"  => "BAIKAL_ADMIN_PASSWORDHASH",
+            "prop"  => "admin_passwordhash",
             "label" => "Admin password",
         ]));
 
         $oMorpho->add(new \Formal\Element\Password([
-            "prop"       => "BAIKAL_ADMIN_PASSWORDHASH_CONFIRM",
+            "prop"       => "admin_passwordhash_confirm",
             "label"      => "Admin password, confirmation",
-            "validation" => "sameas:BAIKAL_ADMIN_PASSWORDHASH",
+            "validation" => "sameas:admin_passwordhash",
         ]));
 
-        if (!defined("BAIKAL_ADMIN_PASSWORDHASH") || trim(BAIKAL_ADMIN_PASSWORDHASH) === "") {
+        try {
+            $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+        } catch (\Exception $e) {
+            error_log('Error reading baikal.yaml file : ' . $e->getMessage());
+        }
+
+        if (!isset($config['system']["admin_passwordhash"]) || trim($config['system']["admin_passwordhash"]) === "") {
 
             # No password set (Form is used in install tool), so password is required as it has to be defined
-            $oMorpho->element("BAIKAL_ADMIN_PASSWORDHASH")->setOption("validation", "required");
+            $oMorpho->element("admin_passwordhash")->setOption("validation", "required");
         } else {
             $sNotice = "-- Leave empty to keep current password --";
-            $oMorpho->element("BAIKAL_ADMIN_PASSWORDHASH")->setOption("placeholder", $sNotice);
-            $oMorpho->element("BAIKAL_ADMIN_PASSWORDHASH_CONFIRM")->setOption("placeholder", $sNotice);
+            $oMorpho->element("admin_passwordhash")->setOption("placeholder", $sNotice);
+            $oMorpho->element("admin_passwordhash_confirm")->setOption("placeholder", $sNotice);
         }
 
         return $oMorpho;
@@ -128,12 +142,12 @@ class Standard extends \Baikal\Model\Config {
     }
 
     function set($sProp, $sValue) {
-        if ($sProp === "BAIKAL_ADMIN_PASSWORDHASH" || $sProp === "BAIKAL_ADMIN_PASSWORDHASH_CONFIRM") {
+        if ($sProp === "admin_passwordhash" || $sProp === "admin_passwordhash_confirm") {
             # Special handling for password and passwordconfirm
 
-            if ($sProp === "BAIKAL_ADMIN_PASSWORDHASH" && $sValue !== "") {
+            if ($sProp === "admin_passwordhash" && $sValue !== "") {
                 parent::set(
-                    "BAIKAL_ADMIN_PASSWORDHASH",
+                    "admin_passwordhash",
                     \BaikalAdmin\Core\Auth::hashAdminPassword($sValue)
                 );
             }
@@ -145,59 +159,10 @@ class Standard extends \Baikal\Model\Config {
     }
 
     function get($sProp) {
-        if ($sProp === "BAIKAL_ADMIN_PASSWORDHASH" || $sProp === "BAIKAL_ADMIN_PASSWORDHASH_CONFIRM") {
+        if ($sProp === "admin_passwordhash" || $sProp === "admin_passwordhash_confirm") {
             return "";
         }
 
         return parent::get($sProp);
     }
-
-    protected function createDefaultConfigFilesIfNeeded() {
-
-        # Create empty config.php if needed
-        if (!file_exists(PROJECT_PATH_SPECIFIC . "config.php")) {
-            @touch(PROJECT_PATH_SPECIFIC . "config.php");
-            $sContent = "<?php\n" . \Baikal\Core\Tools::getCopyrightNotice() . "\n\n";
-            $sContent .= $this->getDefaultConfig();
-            file_put_contents(PROJECT_PATH_SPECIFIC . "config.php", $sContent);
-        }
-
-        # Create empty config.system.php if needed
-        if (!file_exists(PROJECT_PATH_SPECIFIC . "config.system.php")) {
-            @touch(PROJECT_PATH_SPECIFIC . "config.system.php");
-            $sContent = "<?php\n" . \Baikal\Core\Tools::getCopyrightNotice() . "\n\n";
-            $sContent .= $this->getDefaultSystemConfig();
-            file_put_contents(PROJECT_PATH_SPECIFIC . "config.system.php", $sContent);
-        }
-    }
-
-    protected static function getDefaultConfig() {
-
-        $sCode = <<<CODE
-##############################################################################
-# Required configuration
-# You *have* to review these settings for Baïkal to run properly
-#
-
-# Timezone of your users, if unsure, check http://en.wikipedia.org/wiki/List_of_tz_database_time_zones
-define("PROJECT_TIMEZONE", "Europe/Paris");
-
-# CardDAV ON/OFF switch; default TRUE
-define("BAIKAL_CARD_ENABLED", TRUE);
-
-# CalDAV ON/OFF switch; default TRUE
-define("BAIKAL_CAL_ENABLED", TRUE);
-
-# CalDAV invite From: mail address (comment or leave blank to disable notifications)
-define("BAIKAL_INVITE_FROM", "noreply@$_SERVER[SERVER_NAME]");
-
-# WebDAV authentication type; default Digest
-define("BAIKAL_DAV_AUTH_TYPE", "Digest");
-
-# Baïkal Web admin password hash; Set via Baïkal Web Admin
-define("BAIKAL_ADMIN_PASSWORDHASH", "");
-CODE;
-        $sCode = trim($sCode);
-        return $sCode;
-    }
 }
diff --git a/Core/Frameworks/Baikal/Model/Config/System.php b/Core/Frameworks/Baikal/Model/Config/System.php
index 42feb7e..980c19f 100644
--- a/Core/Frameworks/Baikal/Model/Config/System.php
+++ b/Core/Frameworks/Baikal/Model/Config/System.php
@@ -30,51 +30,35 @@ namespace Baikal\Model\Config;
 class System extends \Baikal\Model\Config {
 
     protected $aConstants = [
-        "BAIKAL_AUTH_REALM" => [
-            "type"    => "string",
-            "comment" => "If you change this value, you'll have to re-generate passwords for all your users",
-        ],
-        "BAIKAL_CARD_BASEURI" => [
-            "type"    => "litteral",
-            "comment" => 'Should begin and end with a "/"',
-        ],
-        "BAIKAL_CAL_BASEURI" => [
-            "type"    => "litteral",
-            "comment" => 'Should begin and end with a "/"',
-        ],
-        "BAIKAL_DAV_BASEURI" => [
-            "type"    => "litteral",
-            "comment" => 'Should begin and end with a "/"',
-        ],
-        "PROJECT_SQLITE_FILE" => [
+        "sqlite_file" => [
             "type"    => "litteral",
             "comment" => "Define path to Baïkal Database SQLite file",
         ],
-        "PROJECT_DB_MYSQL" => [
+        "mysql" => [
             "type"    => "boolean",
             "comment" => "MySQL > Use MySQL instead of SQLite ?",
         ],
-        "PROJECT_DB_MYSQL_HOST" => [
+        "mysql_host" => [
             "type"    => "string",
             "comment" => "MySQL > Host, including ':portnumber' if port is not the default one (3306)",
         ],
-        "PROJECT_DB_MYSQL_DBNAME" => [
+        "mysql_dbname" => [
             "type"    => "string",
             "comment" => "MySQL > Database name",
         ],
-        "PROJECT_DB_MYSQL_USERNAME" => [
+        "mysql_username" => [
             "type"    => "string",
             "comment" => "MySQL > Username",
         ],
-        "PROJECT_DB_MYSQL_PASSWORD" => [
+        "mysql_password" => [
             "type"    => "string",
             "comment" => "MySQL > Password",
         ],
-        "BAIKAL_ENCRYPTION_KEY" => [
+        "baikal_encryption_key" => [
             "type"    => "string",
             "comment" => "A random 32 bytes key that will be used to encrypt data",
         ],
-        "BAIKAL_CONFIGURED_VERSION" => [
+        "baikal_configured_version" => [
             "type"    => "string",
             "comment" => "The currently configured Baïkal version",
         ],
@@ -82,68 +66,25 @@ class System extends \Baikal\Model\Config {
 
     # Default values
     protected $aData = [
-        "BAIKAL_AUTH_REALM"         => "BaikalDAV",
-        "BAIKAL_CARD_BASEURI"       => 'PROJECT_BASEURI . "card.php/"',
-        "BAIKAL_CAL_BASEURI"        => 'PROJECT_BASEURI . "cal.php/"',
-        "BAIKAL_DAV_BASEURI"        => 'PROJECT_BASEURI . "dav.php/"',
-        "PROJECT_SQLITE_FILE"       => 'PROJECT_PATH_SPECIFIC . "db/db.sqlite"',
-        "PROJECT_DB_MYSQL"          => false,
-        "PROJECT_DB_MYSQL_HOST"     => "",
-        "PROJECT_DB_MYSQL_DBNAME"   => "",
-        "PROJECT_DB_MYSQL_USERNAME" => "",
-        "PROJECT_DB_MYSQL_PASSWORD" => "",
-        "BAIKAL_ENCRYPTION_KEY"     => "",
-        "BAIKAL_CONFIGURED_VERSION" => "",
+        "sqlite_file"        => PROJECT_PATH_SPECIFIC . "db/db.sqlite",
+        "mysql"              => false,
+        "mysql_host"         => "",
+        "mysql_dbname"       => "",
+        "mysql_username"     => "",
+        "mysql_password"     => "",
+        "encryption_key"     => "",
+        "configured_version" => "",
     ];
 
+    function __construct() {
+        parent::__construct("database");
+    }
+
     function formMorphologyForThisModelInstance() {
         $oMorpho = new \Formal\Form\Morphology();
 
         $oMorpho->add(new \Formal\Element\Text([
-            "prop"       => "BAIKAL_CAL_BASEURI",
-            "label"      => "CalDAV base URI",
-            "validation" => "required",
-            "help"       => "The absolute web path to cal.php",
-            "popover"    => [
-                "title"   => "CalDAV base URI",
-                "content" => "If Baïkal is hosted in a subfolder, this path should reflect it.<br /><strong>Whatever happens, it should begin and end with a slash.</strong>",
-            ]
-        ]));
-
-        $oMorpho->add(new \Formal\Element\Text([
-            "prop"       => "BAIKAL_CARD_BASEURI",
-            "label"      => "CardDAV base URI",
-            "validation" => "required",
-            "help"       => "The absolute web path to card.php",
-            "popover"    => [
-                "title"   => "CardDAV base URI",
-                "content" => "If Baïkal is hosted in a subfolder, this path should reflect it.<br /><strong>Whatever happens, it should begin and end with a slash.</strong>"
-            ]
-        ]));
-        $oMorpho->add(new \Formal\Element\Text([
-            "prop"       => "BAIKAL_DAV_BASEURI",
-            "label"      => "CalDAV/CardDAV base URI",
-            "validation" => "required",
-            "help"       => "The absolute web path to dav.php",
-            "popover"    => [
-                "title"   => "DAV base URI",
-                "content" => "If Baïkal is hosted in a subfolder, this path should reflect it.<br /><strong>Whatever happens, it should begin and end with a slash.</strong>"
-            ]
-        ]));
-
-        $oMorpho->add(new \Formal\Element\Text([
-            "prop"       => "BAIKAL_AUTH_REALM",
-            "label"      => "Auth realm",
-            "validation" => "required",
-            "help"       => "Token used in authentication process.<br />If you change this, you'll have to reset all your users passwords.<br />You'll also loose access to this admin interface.",
-            "popover"    => [
-                "title"   => "Auth realm",
-                "content" => "If you change this, you'll loose your access to this interface.<br />In other words: <strong>you should not change this, unless YKWYD.</strong>"
-            ]
-        ]));
-
-        $oMorpho->add(new \Formal\Element\Text([
-            "prop"       => "PROJECT_SQLITE_FILE",
+            "prop"       => "sqlite_file",
             "label"      => "SQLite file path",
             "validation" => "required",
             "inputclass" => "input-xxlarge",
@@ -151,30 +92,30 @@ class System extends \Baikal\Model\Config {
         ]));
 
         $oMorpho->add(new \Formal\Element\Checkbox([
-            "prop"            => "PROJECT_DB_MYSQL",
+            "prop"            => "mysql",
             "label"           => "Use MySQL",
             "help"            => "If checked, Baïkal will use MySQL instead of SQLite.",
             "refreshonchange" => true,
         ]));
 
         $oMorpho->add(new \Formal\Element\Text([
-            "prop"  => "PROJECT_DB_MYSQL_HOST",
+            "prop"  => "mysql_host",
             "label" => "MySQL host",
             "help"  => "Host ip or name, including ':portnumber' if port is not the default one (3306)"
         ]));
 
         $oMorpho->add(new \Formal\Element\Text([
-            "prop"  => "PROJECT_DB_MYSQL_DBNAME",
+            "prop"  => "mysql_dbname",
             "label" => "MySQL database name",
         ]));
 
         $oMorpho->add(new \Formal\Element\Text([
-            "prop"  => "PROJECT_DB_MYSQL_USERNAME",
+            "prop"  => "mysql_username",
             "label" => "MySQL username",
         ]));
 
         $oMorpho->add(new \Formal\Element\Password([
-            "prop"  => "PROJECT_DB_MYSQL_PASSWORD",
+            "prop"  => "mysql_password",
             "label" => "MySQL password",
         ]));
 
@@ -184,59 +125,4 @@ class System extends \Baikal\Model\Config {
     function label() {
         return "Baïkal Settings";
     }
-
-    protected static function getDefaultConfig() {
-
-        $sBaikalVersion = BAIKAL_VERSION;
-
-        $sCode = <<<CODE
-##############################################################################
-# System configuration
-# Should not be changed, unless YNWYD
-#
-# RULES
-#	0. All folder pathes *must* be suffixed by "/"
-#	1. All URIs *must* be suffixed by "/" if pointing to a folder
-#
-
-# If you change this value, you'll have to re-generate passwords for all your users
-define("BAIKAL_AUTH_REALM", "BaikalDAV");
-
-# Should begin and end with a "/"
-define("BAIKAL_CARD_BASEURI", PROJECT_BASEURI . "card.php/");
-
-# Should begin and end with a "/"
-define("BAIKAL_CAL_BASEURI", PROJECT_BASEURI . "cal.php/");
-
-# Should begin and end with a "/"
-define("BAIKAL_DAV_BASEURI", PROJECT_BASEURI . "dav.php/");
-
-# Define path to Baïkal Database SQLite file
-define("PROJECT_SQLITE_FILE", PROJECT_PATH_SPECIFIC . "db/db.sqlite");
-
-# MySQL > Use MySQL instead of SQLite ?
-define("PROJECT_DB_MYSQL", FALSE);
-
-# MySQL > Host, including ':portnumber' if port is not the default one (3306)
-define("PROJECT_DB_MYSQL_HOST", "");
-
-# MySQL > Database name
-define("PROJECT_DB_MYSQL_DBNAME", "");
-
-# MySQL > Username
-define("PROJECT_DB_MYSQL_USERNAME", "");
-
-# MySQL > Password
-define("PROJECT_DB_MYSQL_PASSWORD", "");
-
-# A random 32 bytes key that will be used to encrypt data
-define("BAIKAL_ENCRYPTION_KEY", "");
-
-# The currently configured Baïkal version
-define("BAIKAL_CONFIGURED_VERSION", "{$sBaikalVersion}");
-
-CODE;
-        $sCode = trim($sCode);
-        return $sCode;
-    }
 }
diff --git a/Core/Frameworks/Baikal/Model/User.php b/Core/Frameworks/Baikal/Model/User.php
index f744f99..9a63898 100644
--- a/Core/Frameworks/Baikal/Model/User.php
+++ b/Core/Frameworks/Baikal/Model/User.php
@@ -27,6 +27,8 @@
 
 namespace Baikal\Model;
 
+use Symfony\Component\Yaml\Yaml;
+
 class User extends \Flake\Core\Model\Db {
     const DATATABLE = "users";
     const PRIMARYKEY = "id";
@@ -279,6 +281,13 @@ class User extends \Flake\Core\Model\Db {
     }
 
     function getPasswordHashForPassword($sPassword) {
-        return md5($this->get("username") . ':' . BAIKAL_AUTH_REALM . ':' . $sPassword);
+
+        try {
+            $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+        } catch (\Exception $e) {
+            error_log('Error reading baikal.yaml file : ' . $e->getMessage());
+        }
+
+        return md5($this->get("username") . ':' . $config['system']['auth_realm'] . ':' . $sPassword);
     }
 }
diff --git a/Core/Frameworks/BaikalAdmin/Controller/Dashboard.php b/Core/Frameworks/BaikalAdmin/Controller/Dashboard.php
index 9e59da4..0988f22 100644
--- a/Core/Frameworks/BaikalAdmin/Controller/Dashboard.php
+++ b/Core/Frameworks/BaikalAdmin/Controller/Dashboard.php
@@ -27,18 +27,23 @@
 
 namespace BaikalAdmin\Controller;
 
+use Symfony\Component\Yaml\Yaml;
+
 class Dashboard extends \Flake\Core\Controller {
 
     function execute() {
     }
 
     function render() {
+
+        $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+
         $oView = new \BaikalAdmin\View\Dashboard();
         $oView->setData("BAIKAL_VERSION", BAIKAL_VERSION);
 
         # Services status
-        $oView->setData("BAIKAL_CAL_ENABLED", BAIKAL_CAL_ENABLED);
-        $oView->setData("BAIKAL_CARD_ENABLED", BAIKAL_CARD_ENABLED);
+        $oView->setData("baikal_cal_enabled", $config['system']['cal_enabled']);
+        $oView->setData("baikal_card_enabled", $config['system']['card_enabled']);
 
         # Statistics: Users
         $iNbUsers = \Baikal\Model\User::getBaseRequester()->count();
diff --git a/Core/Frameworks/BaikalAdmin/Controller/Install/Database.php b/Core/Frameworks/BaikalAdmin/Controller/Install/Database.php
index d16a8fa..76a4800 100644
--- a/Core/Frameworks/BaikalAdmin/Controller/Install/Database.php
+++ b/Core/Frameworks/BaikalAdmin/Controller/Install/Database.php
@@ -27,6 +27,8 @@
 
 namespace BaikalAdmin\Controller\Install;
 
+use Symfony\Component\Yaml\Yaml;
+
 class Database extends \Flake\Core\Controller {
 
     protected $aMessages = [];
@@ -34,7 +36,18 @@ class Database extends \Flake\Core\Controller {
     protected $oForm;    # \Formal\Form
 
     function execute() {
-        $this->oModel = new \Baikal\Model\Config\Database(PROJECT_PATH_SPECIFIC . "config.system.php");
+        $this->oModel = new \Baikal\Model\Config\System();
+
+        if (file_exists(PROJECT_PATH_SPECIFIC . "config.system.php")) {
+            require_once(PROJECT_PATH_SPECIFIC . "config.system.php");
+            $this->oModel->set('sqlite_file', PROJECT_SQLITE_FILE);
+            $this->oModel->set('mysql', PROJECT_DB_MYSQL);
+            $this->oModel->set('mysql_host', PROJECT_DB_MYSQL_HOST);
+            $this->oModel->set('mysql_dbname', PROJECT_DB_MYSQL_DBNAME);
+            $this->oModel->set('mysql_username', PROJECT_DB_MYSQL_USERNAME);
+            $this->oModel->set('mysql_password', PROJECT_DB_MYSQL_PASSWORD);
+            $this->oModel->set('encryption_key', BAIKAL_ENCRYPTION_KEY);
+        }
 
         $this->oForm = $this->oModel->formForThisModelInstance([
             "close"           => false,
@@ -46,6 +59,9 @@ class Database extends \Flake\Core\Controller {
             $this->oForm->execute();
 
             if ($this->oForm->persisted()) {
+                if (file_exists(PROJECT_PATH_SPECIFIC . "config.system.php")) {
+                    @unlink(PROJECT_PATH_SPECIFIC . "config.system.php");
+                }
                 touch(PROJECT_PATH_SPECIFIC . '/INSTALL_DISABLED');
             }
         }
@@ -60,7 +76,7 @@ class Database extends \Flake\Core\Controller {
 
         if ($this->oForm->persisted()) {
 
-            $sMessage = "<p>Baïkal is now installed, and it's database properly configured. <strong>For security reasons, this installation wizard is now disabled.</strong></p>";
+            $sMessage = "<p>Baïkal is now installed, and its database properly configured. <strong>For security reasons, this installation wizard is now disabled.</strong></p>";
             $sMessage . "<p>&nbsp;</p>";
             $sMessage .= "<p><a class='btn btn-success' href='" . PROJECT_URI . "admin/'>Start using Baïkal</a></p>";
             $sForm = "";
@@ -79,14 +95,14 @@ class Database extends \Flake\Core\Controller {
         if ($oForm->refreshed()){
             return true;
         }
-        $bMySQLEnabled = $oMorpho->element("PROJECT_DB_MYSQL")->value();
+        $bMySQLEnabled = $oMorpho->element("mysql")->value();
 
         if ($bMySQLEnabled) {
 
-            $sHost = $oMorpho->element("PROJECT_DB_MYSQL_HOST")->value();
-            $sDbname = $oMorpho->element("PROJECT_DB_MYSQL_DBNAME")->value();
-            $sUsername = $oMorpho->element("PROJECT_DB_MYSQL_USERNAME")->value();
-            $sPassword = $oMorpho->element("PROJECT_DB_MYSQL_PASSWORD")->value();
+            $sHost = $oMorpho->element("mysql_host")->value();
+            $sDbname = $oMorpho->element("mysql_dbname")->value();
+            $sUsername = $oMorpho->element("mysql_username")->value();
+            $sPassword = $oMorpho->element("mysql_password")->value();
 
             try {
                 $oDb = new \Flake\Core\Database\Mysql(
@@ -107,7 +123,7 @@ class Database extends \Flake\Core\Controller {
                         $sMessage .= "<br /><p>Nothing has been saved. <strong>Please, add these tables to the database before pursuing Baïkal initialization.</strong></p>";
 
                         $oForm->declareError(
-                            $oMorpho->element("PROJECT_DB_MYSQL"),
+                            $oMorpho->element("mysql"),
                             $sMessage
                         );
                     } else {
@@ -120,35 +136,29 @@ class Database extends \Flake\Core\Controller {
 
                 return true;
             } catch (\Exception $e) {
-                $oForm->declareError($oMorpho->element("PROJECT_DB_MYSQL"),
+                $oForm->declareError($oMorpho->element("mysql"),
                     "Baïkal was not able to establish a connexion to the MySQL database as configured.<br />MySQL says: " . $e->getMessage());
-                $oForm->declareError($oMorpho->element("PROJECT_DB_MYSQL_HOST"));
-                $oForm->declareError($oMorpho->element("PROJECT_DB_MYSQL_DBNAME"));
-                $oForm->declareError($oMorpho->element("PROJECT_DB_MYSQL_USERNAME"));
-                $oForm->declareError($oMorpho->element("PROJECT_DB_MYSQL_PASSWORD"));
+                $oForm->declareError($oMorpho->element("mysql_host"));
+                $oForm->declareError($oMorpho->element("mysql_dbname"));
+                $oForm->declareError($oMorpho->element("mysql_username"));
+                $oForm->declareError($oMorpho->element("mysql_password"));
             }
         } else {
 
-            $sFile = $oMorpho->element("PROJECT_SQLITE_FILE")->value();
+            $sFile = $oMorpho->element("sqlite_file")->value();
 
             try {
 
-                // not sure yet how to better address this
-                // yup! this is mental, but even if we don't use eval, effectively these
-                // config settings are eval'ed because they are written as raw php files.
-                // We'll have to clean this up later.
-                $sFile = eval('return ' . $sFile . ';');
-
                 # Asserting DB file is writable
                 if (file_exists($sFile) && !is_writable($sFile)) {
                     $sMessage = "DB file is not writable. Please give write permissions on file <span style='font-family: monospace'>" . $sFile . "</span>";
-                    $oForm->declareError($oMorpho->element("PROJECT_SQLITE_FILE"), $sMessage);
+                    $oForm->declareError($oMorpho->element("sqlite_file"), $sMessage);
                     return false;
                 }
                 # Asserting DB directory is writable
                 if (!is_writable(dirname($sFile))) {
                     $sMessage = "The <em>FOLDER</em> containing the DB file is not writable, and it has to.<br />Please give write permissions on folder <span style='font-family: monospace'>" . dirname($sFile) . "</span>";
-                    $oForm->declareError($oMorpho->element("PROJECT_SQLITE_FILE"), $sMessage);
+                    $oForm->declareError($oMorpho->element("sqlite_file"), $sMessage);
                     return false;
                 }
 
@@ -168,7 +178,7 @@ class Database extends \Flake\Core\Controller {
                         $sMessage .= "<br /><p>Nothing has been saved. <strong>Please, add these tables to the database before pursuing Baïkal initialization.</strong></p>";
 
                         $oForm->declareError(
-                            $oMorpho->element("PROJECT_SQLITE_FILE"),
+                            $oMorpho->element("sqlite_file"),
                             $sMessage
                         );
                     } else {
@@ -185,7 +195,7 @@ class Database extends \Flake\Core\Controller {
                 return true;
             } catch (\Exception $e) {
                 $oForm->declareError(
-                    $oMorpho->element("PROJECT_SQLITE_FILE"),
+                    $oMorpho->element("sqlite_file"),
                     "Baïkal was not able to establish a connexion to the SQLite database as configured.<br />SQLite says: " . $e->getMessage() . (string)$e
                 );
             }
@@ -196,19 +206,24 @@ class Database extends \Flake\Core\Controller {
     function hideMySQLFieldWhenNeeded(\Formal\Form $oForm, \Formal\Form\Morphology $oMorpho) {
 
         if ($oForm->submitted()) {
-            $bMySQL = (intval($oForm->postValue("PROJECT_DB_MYSQL")) === 1);
+            $bMySQL = (intval($oForm->postValue("mysql")) === 1);
         } else {
-            $bMySQL = PROJECT_DB_MYSQL;
+            try {
+                $configSystem = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+            } catch (\Exception $e) {
+                error_log('Error reading baikal.yaml file : ' . $e->getMessage());
+            }
+            $bMySQL = $configSystem['database']['mysql'] ?? true;
         }
 
         if ($bMySQL === true) {
-            $oMorpho->remove("PROJECT_SQLITE_FILE");
+            $oMorpho->remove("sqlite_file");
         } else {
 
-            $oMorpho->remove("PROJECT_DB_MYSQL_HOST");
-            $oMorpho->remove("PROJECT_DB_MYSQL_DBNAME");
-            $oMorpho->remove("PROJECT_DB_MYSQL_USERNAME");
-            $oMorpho->remove("PROJECT_DB_MYSQL_PASSWORD");
+            $oMorpho->remove("mysql_host");
+            $oMorpho->remove("mysql_dbname");
+            $oMorpho->remove("mysql_username");
+            $oMorpho->remove("mysql_password");
         }
     }
 }
diff --git a/Core/Frameworks/BaikalAdmin/Controller/Install/Initialize.php b/Core/Frameworks/BaikalAdmin/Controller/Install/Initialize.php
index 04ec977..47c1c79 100644
--- a/Core/Frameworks/BaikalAdmin/Controller/Install/Initialize.php
+++ b/Core/Frameworks/BaikalAdmin/Controller/Install/Initialize.php
@@ -36,16 +36,26 @@ class Initialize extends \Flake\Core\Controller {
     function execute() {
         # Assert that /Specific is writable
 
-        if (!file_exists(PROJECT_PATH_SPECIFIC) || !is_dir(PROJECT_PATH_SPECIFIC) || !is_writable(PROJECT_PATH_SPECIFIC)) {
-            $message = "<h1>Error - Insufficient  permissions on the <span style='background-color: yellow;'>Specific/</span> folder</h1><p>";
-            $message .= "<p>In order to work properly, Baïkal needs to have write permissions in the <strong>Specific/</strong> folder.</p>";
+        if (!file_exists(PROJECT_PATH_SPECIFIC) || !is_dir(PROJECT_PATH_SPECIFIC) || !is_writable(PROJECT_PATH_SPECIFIC) || !file_exists(PROJECT_PATH_CONFIG) || !is_dir(PROJECT_PATH_CONFIG) || !is_writable(PROJECT_PATH_CONFIG)) {
+            $message = "<h1>Error - Insufficient  permissions on the configuration folders</h1><p>";
+            $message .= "<p>In order to work properly, Baïkal needs to have write permissions in the <strong>Specific/</strong> and <strong>config/</strong> folder.</p>";
 
             die($message);
         }
 
         $this->createHtaccessFilesIfNeeded();
 
-        $this->oModel = new \Baikal\Model\Config\Standard(PROJECT_PATH_SPECIFIC . "config.php");
+        $this->oModel = new \Baikal\Model\Config\Standard();
+
+        // If we come from pre-0.7.0, we need to get the values from the config.php and config.system.php files
+        if (file_exists(PROJECT_PATH_SPECIFIC . "config.php")) {
+            require_once(PROJECT_PATH_SPECIFIC . "config.php");
+            $this->oModel->set('timezone', PROJECT_TIMEZONE);
+            $this->oModel->set('card_enabled', BAIKAL_CARD_ENABLED);
+            $this->oModel->set('cal_enabled', BAIKAL_CAL_ENABLED);
+            $this->oModel->set('invite_from', BAIKAL_INVITE_FROM);
+            $this->oModel->set('dav_auth_type', BAIKAL_DAV_AUTH_TYPE);
+        }
 
         $this->oForm = $this->oModel->formForThisModelInstance([
             "close" => false
@@ -56,14 +66,22 @@ class Initialize extends \Flake\Core\Controller {
 
             if ($this->oForm->persisted()) {
 
+                // If we come from pre-0.7.0, we need to remove the INSTALL_DISABLED file so we go to the next step
+                if (file_exists(PROJECT_PATH_SPECIFIC . '/INSTALL_DISABLED')) {
+                    @unlink(PROJECT_PATH_SPECIFIC . '/INSTALL_DISABLED');
+                }
+                if (file_exists(PROJECT_PATH_SPECIFIC . "config.php")) {
+                    @unlink(PROJECT_PATH_SPECIFIC . "config.php");
+                }
+
                 # Creating system config, and initializing BAIKAL_ENCRYPTION_KEY
-                $oSystemConfig = new \Baikal\Model\Config\System(PROJECT_PATH_SPECIFIC . "config.system.php");
-                $oSystemConfig->set("BAIKAL_ENCRYPTION_KEY",  md5(microtime() . rand()));
+                $oSystemConfig = new \Baikal\Model\Config\System("system");
+                $oSystemConfig->set("encryption_key",  md5(microtime() . rand()));
 
                 # Default: PDO::SQLite or PDO::MySQL ?
                 $aPDODrivers = \PDO::getAvailableDrivers();
                 if (!in_array('sqlite', $aPDODrivers)) {    # PDO::MySQL is already asserted in \Baikal\Core\Tools::assertEnvironmentIsOk()
-                    $oSystemConfig->set("PROJECT_DB_MYSQL",  true);
+                    $oSystemConfig->set("mysql",  true);
                 }
 
                 $oSystemConfig->persist();
@@ -79,6 +97,11 @@ class Initialize extends \Flake\Core\Controller {
         $oView = new \BaikalAdmin\View\Install\Initialize();
         $oView->setData("baikalversion", BAIKAL_VERSION);
 
+        // If we come from pre-0.7.0 (old config files are still present),
+        // we need to tell the installer page to show a warning message.
+        $oView->setData("oldConfigSystem", file_exists(PROJECT_PATH_SPECIFIC . "config.system.php"));
+
+
         if ($this->oForm->persisted()) {
             $sLink = PROJECT_URI . "admin/install/?/database";
             \Flake\Util\Tools::redirect($sLink);
diff --git a/Core/Frameworks/BaikalAdmin/Controller/Install/UpgradeConfirmation.php b/Core/Frameworks/BaikalAdmin/Controller/Install/UpgradeConfirmation.php
index d4ce825..822df29 100644
--- a/Core/Frameworks/BaikalAdmin/Controller/Install/UpgradeConfirmation.php
+++ b/Core/Frameworks/BaikalAdmin/Controller/Install/UpgradeConfirmation.php
@@ -27,6 +27,8 @@
 
 namespace BaikalAdmin\Controller\Install;
 
+use Symfony\Component\Yaml\Yaml;
+
 class UpgradeConfirmation extends \Flake\Core\Controller {
 
     function execute() {
@@ -35,10 +37,16 @@ class UpgradeConfirmation extends \Flake\Core\Controller {
     function render() {
         $oView = new \BaikalAdmin\View\Install\UpgradeConfirmation();
 
-        if (BAIKAL_CONFIGURED_VERSION === BAIKAL_VERSION) {
-            $sMessage = "Your system is configured to use version <strong>" . BAIKAL_CONFIGURED_VERSION . "</strong>.<br />There's no upgrade to be done.";
+        try {
+            $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+        } catch (\Exception $e) {
+            error_log('Error reading baikal.yaml file : ' . $e->getMessage());
+        }
+
+        if (isset($config['system']['configured_version']) && $config['system']['configured_version'] === BAIKAL_VERSION) {
+            $sMessage = "Your system is configured to use version <strong>" . $config['system']['configured_version'] . "</strong>.<br />There's no upgrade to be done.";
         } else {
-            $sMessage = "Upgrading Baïkal from version <strong>" . BAIKAL_CONFIGURED_VERSION . "</strong> to version <strong>" . BAIKAL_VERSION . "</strong>";
+            $sMessage = "Upgrading Baïkal from version <strong>" . "Unknown" . "</strong> to version <strong>" . BAIKAL_VERSION . "</strong>";
         }
 
         $oView->setData("message", $sMessage);
diff --git a/Core/Frameworks/BaikalAdmin/Controller/Install/VersionUpgrade.php b/Core/Frameworks/BaikalAdmin/Controller/Install/VersionUpgrade.php
index 79d350f..2083615 100644
--- a/Core/Frameworks/BaikalAdmin/Controller/Install/VersionUpgrade.php
+++ b/Core/Frameworks/BaikalAdmin/Controller/Install/VersionUpgrade.php
@@ -27,6 +27,8 @@
 
 namespace BaikalAdmin\Controller\Install;
 
+use Symfony\Component\Yaml\Yaml;
+
 class VersionUpgrade extends \Flake\Core\Controller {
 
     protected $aMessages = [];
@@ -40,11 +42,18 @@ class VersionUpgrade extends \Flake\Core\Controller {
     }
 
     function render() {
+
+        try {
+            $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+        } catch (\Exception $e) {
+            error_log('Error reading baikal.yaml file : ' . $e->getMessage());
+        }
+
         $sBigIcon = "glyph2x-magic";
         $sBaikalVersion = BAIKAL_VERSION;
-        $sBaikalConfiguredVersion = BAIKAL_CONFIGURED_VERSION;
+        $sBaikalConfiguredVersion = $config['system']['configured_version'];
 
-        if (BAIKAL_CONFIGURED_VERSION === BAIKAL_VERSION) {
+        if ($config['system']['configured_version'] === BAIKAL_VERSION) {
             $sMessage = "Your system is configured to use version <strong>" . $sBaikalConfiguredVersion . "</strong>.<br />There's no upgrade to be done.";
         } else {
             $sMessage = "Upgrading Baïkal from version <strong>" . $sBaikalConfiguredVersion . "</strong> to version <strong>" . $sBaikalVersion . "</strong>";
@@ -58,7 +67,7 @@ class VersionUpgrade extends \Flake\Core\Controller {
 HTML;
 
         try {
-            $bSuccess = $this->upgrade(BAIKAL_CONFIGURED_VERSION, BAIKAL_VERSION);
+            $bSuccess = $this->upgrade($config['system']['configured_version'], BAIKAL_VERSION);
         } catch (\Exception $e) {
             $bSuccess = false;
             $this->aErrors[] = 'Uncaught exception during upgrade: ' . (string)$e;
@@ -521,26 +530,17 @@ SQL
     }
 
     protected function updateConfiguredVersion($sVersionTo) {
-
-        # Create new settings
-        $oConfig = new \Baikal\Model\Config\Standard(PROJECT_PATH_SPECIFIC . "config.php");
-        $oConfig->persist();
-
         # Update BAIKAL_CONFIGURED_VERSION
-        $oConfig = new \Baikal\Model\Config\System(PROJECT_PATH_SPECIFIC . "config.system.php");
-        $oConfig->set("BAIKAL_CONFIGURED_VERSION", $sVersionTo);
+        $oConfig = new \Baikal\Model\Config\System();
+        $oConfig->set("baikal_configured_version", $sVersionTo);
         $oConfig->persist();
     }
 
     protected function assertConfigWritable() {
         # Parsing the config also makes sure that it is not malformed
-        $oConfig = new \Baikal\Model\Config\Standard(PROJECT_PATH_SPECIFIC . "config.php");
+        $oConfig = new \Baikal\Model\Config\System();
         if ($oConfig->writable() === false) {
-            throw new \Exception(PROJECT_PATH_SPECIFIC . "config.php is not writable");
-        }
-        $oConfig = new \Baikal\Model\Config\System(PROJECT_PATH_SPECIFIC . "config.system.php");
-        if ($oConfig->writable() === false) {
-            throw new \Exception(PROJECT_PATH_SPECIFIC . "config.system.php is not writable");
+            throw new \Exception(PROJECT_PATH_CONFIG . "baikal.yaml is not writable");
         }
     }
 }
diff --git a/Core/Frameworks/BaikalAdmin/Controller/Settings/Standard.php b/Core/Frameworks/BaikalAdmin/Controller/Settings/Standard.php
index 19e4f27..8782a5a 100644
--- a/Core/Frameworks/BaikalAdmin/Controller/Settings/Standard.php
+++ b/Core/Frameworks/BaikalAdmin/Controller/Settings/Standard.php
@@ -40,7 +40,7 @@ class Standard extends \Flake\Core\Controller {
     private $oForm;
 
     function execute() {
-        $this->oModel = new \Baikal\Model\Config\Standard(PROJECT_PATH_SPECIFIC . "config.php");
+        $this->oModel = new \Baikal\Model\Config\Standard();
 
         # Assert that config file is writable
         if (!$this->oModel->writable()) {
diff --git a/Core/Frameworks/BaikalAdmin/Controller/Settings/System.php b/Core/Frameworks/BaikalAdmin/Controller/Settings/System.php
index 120f74e..9f2c4a3 100644
--- a/Core/Frameworks/BaikalAdmin/Controller/Settings/System.php
+++ b/Core/Frameworks/BaikalAdmin/Controller/Settings/System.php
@@ -27,6 +27,8 @@
 
 namespace BaikalAdmin\Controller\Settings;
 
+use Symfony\Component\Yaml\Yaml;
+
 class System extends \Flake\Core\Controller {
 
     /**
@@ -40,11 +42,11 @@ class System extends \Flake\Core\Controller {
     private $oForm;
 
     function execute() {
-        $this->oModel = new \Baikal\Model\Config\System(PROJECT_PATH_SPECIFIC . "config.system.php");
+        $this->oModel = new \Baikal\Model\Config\System();
 
         # Assert that config file is writable
         if (!$this->oModel->writable()) {
-            throw new \Exception("System config file is not writable;" . __FILE__ . " > " . __LINE__);
+            throw new \Exception("Config file is not writable;" . __FILE__ . " > " . __LINE__);
         }
 
         $this->oForm = $this->oModel->formForThisModelInstance([
@@ -74,19 +76,24 @@ class System extends \Flake\Core\Controller {
 
     function morphologyHook(\Formal\Form $oForm, \Formal\Form\Morphology $oMorpho) {
         if ($oForm->submitted()) {
-            $bMySQL = (intval($oForm->postValue("PROJECT_DB_MYSQL")) === 1);
+            $bMySQL = (intval($oForm->postValue("mysql")) === 1);
         } else {
-            $bMySQL = PROJECT_DB_MYSQL;
+            try {
+                $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+            } catch (\Exception $e) {
+                error_log('Error reading baikal.yaml file : ' . $e->getMessage());
+            }
+            $bMySQL = $config['database']['mysql'] ?? true;
         }
 
         if ($bMySQL === true) {
-            $oMorpho->remove("PROJECT_SQLITE_FILE");
+            $oMorpho->remove("sqlite_file");
         } else {
 
-            $oMorpho->remove("PROJECT_DB_MYSQL_HOST");
-            $oMorpho->remove("PROJECT_DB_MYSQL_DBNAME");
-            $oMorpho->remove("PROJECT_DB_MYSQL_USERNAME");
-            $oMorpho->remove("PROJECT_DB_MYSQL_PASSWORD");
+            $oMorpho->remove("mysql_host");
+            $oMorpho->remove("mysql_dbname");
+            $oMorpho->remove("mysql_username");
+            $oMorpho->remove("mysql_password");
         }
     }
 
@@ -94,13 +101,13 @@ class System extends \Flake\Core\Controller {
         if ($oForm->refreshed()){
             return true;
         }
-        if (intval($oForm->modelInstance()->get("PROJECT_DB_MYSQL")) === 1) {
+        if (intval($oForm->modelInstance()->get("mysql")) === 1) {
 
             # We have to check the MySQL connection
-            $sHost = $oForm->modelInstance()->get("PROJECT_DB_MYSQL_HOST");
-            $sDbName = $oForm->modelInstance()->get("PROJECT_DB_MYSQL_DBNAME");
-            $sUsername = $oForm->modelInstance()->get("PROJECT_DB_MYSQL_USERNAME");
-            $sPassword = $oForm->modelInstance()->get("PROJECT_DB_MYSQL_PASSWORD");
+            $sHost = $oForm->modelInstance()->get("mysql_host");
+            $sDbName = $oForm->modelInstance()->get("mysql_dbname");
+            $sUsername = $oForm->modelInstance()->get("mysql_username");
+            $sPassword = $oForm->modelInstance()->get("mysql_password");
 
             try {
                 $oDB = new \Flake\Core\Database\Mysql(
@@ -112,10 +119,10 @@ class System extends \Flake\Core\Controller {
             } catch (\Exception $e) {
                 $sMessage = "<strong>MySQL error:</strong> " . $e->getMessage();
                 $sMessage .= "<br /><strong>Nothing has been saved</strong>";
-                $oForm->declareError($oMorpho->element("PROJECT_DB_MYSQL_HOST"), $sMessage);
-                $oForm->declareError($oMorpho->element("PROJECT_DB_MYSQL_DBNAME"));
-                $oForm->declareError($oMorpho->element("PROJECT_DB_MYSQL_USERNAME"));
-                $oForm->declareError($oMorpho->element("PROJECT_DB_MYSQL_PASSWORD"));
+                $oForm->declareError($oMorpho->element("mysql_host"), $sMessage);
+                $oForm->declareError($oMorpho->element("mysql_dbname"));
+                $oForm->declareError($oMorpho->element("mysql_username"));
+                $oForm->declareError($oMorpho->element("mysql_password"));
                 return;
             }
 
@@ -124,31 +131,24 @@ class System extends \Flake\Core\Controller {
                 $sMessage .= "You may want create these tables using the file <strong>Core/Resources/Db/MySQL/db.sql</strong>";
                 $sMessage .= "<br /><br /><strong>Nothing has been saved</strong>";
 
-                $oForm->declareError($oMorpho->element("PROJECT_DB_MYSQL"), $sMessage);
+                $oForm->declareError($oMorpho->element("mysql"), $sMessage);
                 return;
             }
         } else {
 
-            $sFile = $oMorpho->element("PROJECT_SQLITE_FILE")->value();
+            $sFile = $oMorpho->element("sqlite_file")->value();
 
             try {
-
-                // not sure yet how to better address this
-                // yup! this is mental, but even if we don't use eval, effectively these
-                // config settings are eval'ed because they are written as raw php files.
-                // We'll have to clean this up later.
-                $sFile = eval('return ' . $sFile . ';');
-
                 # Asserting DB file is writable
                 if (file_exists($sFile) && !is_writable($sFile)) {
                     $sMessage = "DB file is not writable. Please give write permissions on file <span style='font-family: monospace'>" . $sFile . "</span>";
-                    $oForm->declareError($oMorpho->element("PROJECT_SQLITE_FILE"), $sMessage);
+                    $oForm->declareError($oMorpho->element("sqlite_file"), $sMessage);
                     return;
                 }
                 # Asserting DB directory is writable
                 if (!is_writable(dirname($sFile))) {
                     $sMessage = "The <em>FOLDER</em> containing the DB file is not writable, and it has to.<br />Please give write permissions on folder <span style='font-family: monospace'>" . dirname($sFile) . "</span>";
-                    $oForm->declareError($oMorpho->element("PROJECT_SQLITE_FILE"), $sMessage);
+                    $oForm->declareError($oMorpho->element("sqlite_file"), $sMessage);
                     return;
                 }
 
@@ -164,14 +164,14 @@ class System extends \Flake\Core\Controller {
                     $sMessage .= "<br /><p>Nothing has been saved. <strong>Please, add these tables to the database before pursuing Baïkal initialization.</strong></p>";
 
                     $oForm->declareError(
-                        $oMorpho->element("PROJECT_SQLITE_FILE"),
+                        $oMorpho->element("sqlite_file"),
                         $sMessage
                     );
                 }
                 return;
             } catch (\Exception $e) {
                 $oForm->declareError(
-                    $oMorpho->element("PROJECT_SQLITE_FILE"),
+                    $oMorpho->element("sqlite_file"),
                         "Baïkal was not able to establish a connexion to the SQLite database as configured.<br />SQLite says: " . $e->getMessage() . (string)$e
                         );
             }
diff --git a/Core/Frameworks/BaikalAdmin/Core/Auth.php b/Core/Frameworks/BaikalAdmin/Core/Auth.php
index 5f4e81c..78b303f 100644
--- a/Core/Frameworks/BaikalAdmin/Core/Auth.php
+++ b/Core/Frameworks/BaikalAdmin/Core/Auth.php
@@ -27,9 +27,14 @@
 
 namespace BaikalAdmin\Core;
 
+use Symfony\Component\Yaml\Yaml;
+
 class Auth {
     static function isAuthenticated() {
-        if (isset($_SESSION["baikaladminauth"]) && $_SESSION["baikaladminauth"] === md5(BAIKAL_ADMIN_PASSWORDHASH)) {
+
+        $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+
+        if (isset($_SESSION["baikaladminauth"]) && $_SESSION["baikaladminauth"] === md5($config['system']['admin_passwordhash'])) {
             return true;
         }
 
@@ -46,9 +51,13 @@ class Auth {
         $sPass = \Flake\Util\Tools::POST("password");
 
         $sPassHash = self::hashAdminPassword($sPass);
-
-        if ($sUser === "admin" && $sPassHash === BAIKAL_ADMIN_PASSWORDHASH) {
-            $_SESSION["baikaladminauth"] = md5(BAIKAL_ADMIN_PASSWORDHASH);
+        try {
+            $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+        } catch (\Exception $e) {
+            error_log('Error reading baikal.yaml file : ' . $e->getMessage());
+        }
+        if ($sUser === "admin" && $sPassHash === $config['system']['admin_passwordhash']) {
+            $_SESSION["baikaladminauth"] = md5($config['system']['admin_passwordhash']);
             return true;
         }
 
@@ -61,13 +70,17 @@ class Auth {
     }
 
     static function hashAdminPassword($sPassword) {
-        if (defined("BAIKAL_AUTH_REALM")) {
-            $sAuthRealm = BAIKAL_AUTH_REALM;
-        } else {
-            $sAuthRealm = "BaikalDAV";    # Fallback to default value; useful when initializing App, as all constants are not set yet
+
+        try {
+            $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+        } catch (\Exception $e) {
+            error_log('Error reading baikal.yaml file : ' . $e->getMessage());
         }
 
-        return md5('admin:' . $sAuthRealm . ':' . $sPassword);
+        # Fallback to default value; useful when initializing App, as all constants are not set yet
+        $sAuthRealm = $config['system']['auth_realm'] ?? "BaikalDAV";
+
+        return hash('sha256', 'admin:' . $sAuthRealm . ':' . $sPassword);
     }
 
 }
diff --git a/Core/Frameworks/BaikalAdmin/Resources/Templates/Dashboard.html b/Core/Frameworks/BaikalAdmin/Resources/Templates/Dashboard.html
index c8ccbda..a426df4 100644
--- a/Core/Frameworks/BaikalAdmin/Resources/Templates/Dashboard.html
+++ b/Core/Frameworks/BaikalAdmin/Resources/Templates/Dashboard.html
@@ -38,7 +38,7 @@
 		</div>
 		<div class="span3">
 			<h2>Services</h2>
-			{% if BAIKAL_CAL_ENABLED %}
+			{% if cal_enabled %}
 				{% set caldavclass = 'label-success' %}
 				{% set caldavtext = 'On' %}
 			{% else %}
@@ -46,7 +46,7 @@
 				{% set caldavtext = 'Off' %}
 			{% endif %}
 			
-			{% if BAIKAL_CARD_ENABLED %}
+			{% if card_enabled %}
 				{% set carddavclass = 'label-success' %}
 				{% set carddavtext = 'On' %}
 			{% else %}
diff --git a/Core/Frameworks/BaikalAdmin/Resources/Templates/Install/Initialize.html b/Core/Frameworks/BaikalAdmin/Resources/Templates/Install/Initialize.html
index 72791e3..38369d2 100644
--- a/Core/Frameworks/BaikalAdmin/Resources/Templates/Install/Initialize.html
+++ b/Core/Frameworks/BaikalAdmin/Resources/Templates/Install/Initialize.html
@@ -2,6 +2,15 @@
 <header class="jumbotron subhead" id="overview">
 	<h1><i class="glyph2x-magic"></i>Baïkal initialization wizard</h1>
 	<p class="lead">Configure your new Baïkal <strong>{{ baikalversion }}</strong> installation.</p>
+
+  {% if oldConfigSystem %}
+    <div class="alert">
+      <strong>With the 0.7.0 release, our configuration format was updated to use YAML files.</strong><br/>
+      You need to go through this installer again but we pre-filled most values with the ones from your old installation.<br/>
+      As we updated our hashing algorithm for the admin interface password, you need to enter it again.<br/>
+      The database with your contacts and events stays untouched. We still recommend that you make a full backup of your data before proceeding, as a safety measure.
+    </div>
+  {% endif %}
 </header>
 
 <a id="formid"></a>
diff --git a/Core/Frameworks/BaikalAdmin/WWWRoot/install/index.php b/Core/Frameworks/BaikalAdmin/WWWRoot/install/index.php
index 547214f..e1dab04 100644
--- a/Core/Frameworks/BaikalAdmin/WWWRoot/install/index.php
+++ b/Core/Frameworks/BaikalAdmin/WWWRoot/install/index.php
@@ -24,6 +24,8 @@
 *  This copyright notice MUST APPEAR in all copies of the script!
 ***************************************************************/
 
+use Symfony\Component\Yaml\Yaml;
+
 ini_set("session.cookie_httponly", 1);
 ini_set("log_errors", 1);
 $maxtime = ini_get('max_execution_time');
@@ -65,15 +67,22 @@ $oPage->setBaseUrl(PROJECT_URI);
 
 $oPage->zone("navbar")->addBlock(new \BaikalAdmin\Controller\Navigation\Topbar\Install());
 
-if (!defined("BAIKAL_CONFIGURED_VERSION")) {
+try {
+    $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+} catch (\Exception $e) {
+    $config = null;
+    error_log('Error reading baikal.yaml file : ' . $e->getMessage());
+}
+
+if (!$config || !isset($config['system']["configured_version"])) {
     # we have to upgrade Baïkal (existing installation)
     $oPage->zone("Payload")->addBlock(new \BaikalAdmin\Controller\Install\Initialize());
 
-} elseif (!defined("BAIKAL_ADMIN_PASSWORDHASH")) {
+} elseif (!isset($config['system']["admin_passwordhash"])) {
     # we have to set an admin password
     $oPage->zone("Payload")->addBlock(new \BaikalAdmin\Controller\Install\Initialize());
 } else {
-    if (BAIKAL_CONFIGURED_VERSION !== BAIKAL_VERSION) {
+    if ($config['system']["configured_version"] !== BAIKAL_VERSION) {
         # we have to upgrade Baïkal
         if (\Flake\Util\Tools::GET("upgradeConfirmed")) {
             $oPage->zone("Payload")->addBlock(new \BaikalAdmin\Controller\Install\VersionUpgrade());
diff --git a/Core/Frameworks/Flake/Framework.php b/Core/Frameworks/Flake/Framework.php
index 50b9c12..4b9ca24 100644
--- a/Core/Frameworks/Flake/Framework.php
+++ b/Core/Frameworks/Flake/Framework.php
@@ -27,6 +27,8 @@
 
 namespace Flake;
 
+use Symfony\Component\Yaml\Yaml;
+
 class Framework extends \Flake\Core\Framework {
 
     static function rmBeginSlash($sString) {
@@ -150,6 +152,7 @@ class Framework extends \Flake\Core\Framework {
         define("PROJECT_PATH_CORE", PROJECT_PATH_ROOT . "Core/");
         define("PROJECT_PATH_CORERESOURCES", PROJECT_PATH_CORE . "Resources/");
         define("PROJECT_PATH_SPECIFIC", PROJECT_PATH_ROOT . "Specific/");
+        define("PROJECT_PATH_CONFIG", PROJECT_PATH_ROOT . "config/");
         define("PROJECT_PATH_FRAMEWORKS", PROJECT_PATH_CORE . "Frameworks/");
         define("PROJECT_PATH_WWWROOT", PROJECT_PATH_CORE . "WWWRoot/");
 
@@ -206,94 +209,82 @@ class Framework extends \Flake\Core\Framework {
         define("FLAKE_URIPATH", \Flake\Util\Tools::stripBeginSlash($aUrlInfo["path"]));
         unset($aUrlInfo);
 
-
-        # Include Project config
-        # NOTE: DB initialization and App config files inclusion
-        # do not break execution if not properly executed, as
-        # these errors will have to be caught later in the process
-        # notably by the App install tool, if available; breaking right now
-        # would forbid such install tool forwarding, for instance
-
-        $sConfigPath = PROJECT_PATH_SPECIFIC . "config.php";
-        $sConfigSystemPath = PROJECT_PATH_SPECIFIC . "config.system.php";
-
-        if (file_exists($sConfigPath)) {
-            require_once($sConfigPath);
-        }
-
-        if (file_exists($sConfigSystemPath)) {
-            require_once($sConfigSystemPath);
-        }
-
         self::initDb();
     }
 
     protected static function initDb() {
-        # Dont init db on install, but in normal mode and when upgrading
-        if (defined("BAIKAL_CONTEXT_INSTALL") && (!defined('BAIKAL_CONFIGURED_VERSION') || BAIKAL_CONFIGURED_VERSION === BAIKAL_VERSION)) {
+
+        try {
+            $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+        } catch (\Exception $e) {
+            error_log('Error reading baikal.yaml file : ' . $e->getMessage());
             return true;
         }
-        if (defined("PROJECT_DB_MYSQL") && PROJECT_DB_MYSQL === true) {
-            self::initDbMysql();
+        # Dont init db on install, but in normal mode and when upgrading
+        if (defined("BAIKAL_CONTEXT_INSTALL") && (!isset($config['system']['configured_version']) || $config['system']['configured_version'] === BAIKAL_VERSION)) {
+            return true;
+        }
+        if ($config['database']['mysql'] === true) {
+            self::initDbMysql($config);
         } else {
-            self::initDbSqlite();
+            self::initDbSqlite($config);
         }
     }
 
-    protected static function initDbSqlite() {
+    protected static function initDbSqlite(array $config) {
         # Asserting DB filepath is set
-        if (!defined("PROJECT_SQLITE_FILE")) {
+        if (!$config['database']['sqlite_file']) {
             return false;
         }
 
         # Asserting DB file is writable
-        if (file_exists(PROJECT_SQLITE_FILE) && !is_writable(PROJECT_SQLITE_FILE)) {
-            die("<h3>DB file is not writable. Please give write permissions on file '<span style='font-family: monospace; background: yellow;'>" . PROJECT_SQLITE_FILE . "</span>'</h3>");
+        if (file_exists($config['database']['sqlite_file']) && !is_writable($config['database']['sqlite_file'])) {
+            die("<h3>DB file is not writable. Please give write permissions on file '<span style='font-family: monospace; background: yellow;'>" . $config['database']['sqlite_file'] . "</span>'</h3>");
         }
 
         # Asserting DB directory is writable
-        if (!is_writable(dirname(PROJECT_SQLITE_FILE))) {
-            die("<h3>The <em>FOLDER</em> containing the DB file is not writable, and it has to.<br />Please give write permissions on folder '<span style='font-family: monospace; background: yellow;'>" . dirname(PROJECT_SQLITE_FILE) . "</span>'</h3>");
+        if (!is_writable(dirname($config['database']['sqlite_file']))) {
+            die("<h3>The <em>FOLDER</em> containing the DB file is not writable, and it has to.<br />Please give write permissions on folder '<span style='font-family: monospace; background: yellow;'>" . dirname($config['database']['sqlite_file']) . "</span>'</h3>");
         }
 
-        if (file_exists(PROJECT_SQLITE_FILE) && is_readable(PROJECT_SQLITE_FILE) && !isset($GLOBALS["DB"])) {
-            $GLOBALS["DB"] = new \Flake\Core\Database\Sqlite(PROJECT_SQLITE_FILE);
+        if (file_exists($config['database']['sqlite_file']) && is_readable($config['database']['sqlite_file']) && !isset($GLOBALS["DB"])) {
+            $GLOBALS["DB"] = new \Flake\Core\Database\Sqlite($config['database']['sqlite_file']);
             return true;
         }
 
         return false;
     }
 
-    protected static function initDbMysql() {
+    protected static function initDbMysql(array $config) {
 
-        if (!defined("PROJECT_DB_MYSQL_HOST")) {
-            die("<h3>The constant PROJECT_DB_MYSQL_HOST, containing the MySQL host name, is not set.<br />You should set it in Specific/config.system.php</h3>");
+        if (!$config['database']['mysql_host']) {
+            die("<h3>The constant PROJECT_DB_MYSQL_HOST, containing the MySQL host name, is not set.<br />You should set it in config/baikal.yaml</h3>");
         }
 
-        if (!defined("PROJECT_DB_MYSQL_DBNAME")) {
-            die("<h3>The constant PROJECT_DB_MYSQL_DBNAME, containing the MySQL database name, is not set.<br />You should set it in Specific/config.system.php</h3>");
+        if (!$config['database']['mysql_dbname']) {
+            die("<h3>The constant PROJECT_DB_MYSQL_DBNAME, containing the MySQL database name, is not set.<br />You should set it in config/baikal.yaml</h3>");
         }
 
-        if (!defined("PROJECT_DB_MYSQL_USERNAME")) {
-            die("<h3>The constant PROJECT_DB_MYSQL_USERNAME, containing the MySQL database username, is not set.<br />You should set it in Specific/config.system.php</h3>");
+        if (!$config['database']['mysql_username']) {
+            die("<h3>The constant PROJECT_DB_MYSQL_USERNAME, containing the MySQL database username, is not set.<br />You should set it in config/baikal.yaml</h3>");
         }
 
-        if (!defined("PROJECT_DB_MYSQL_PASSWORD")) {
-            die("<h3>The constant PROJECT_DB_MYSQL_PASSWORD, containing the MySQL database password, is not set.<br />You should set it in Specific/config.system.php</h3>");
+        if (!$config['database']['mysql_password']) {
+            die("<h3>The constant PROJECT_DB_MYSQL_PASSWORD, containing the MySQL database password, is not set.<br />You should set it in config/baikal.yaml</h3>");
         }
 
         try {
             $GLOBALS["DB"] = new \Flake\Core\Database\Mysql(
-                PROJECT_DB_MYSQL_HOST,
-                PROJECT_DB_MYSQL_DBNAME,
-                PROJECT_DB_MYSQL_USERNAME,
-                PROJECT_DB_MYSQL_PASSWORD
+                $config['database']['mysql_host'],
+                $config['database']['mysql_dbname'],
+                $config['database']['mysql_username'],
+                $config['database']['mysql_password']
             );
 
             # We now setup t6he connexion to use UTF8
             $GLOBALS["DB"]->query("SET NAMES UTF8");
         } catch (\Exception $e) {
-            die("<h3>Baïkal was not able to establish a connexion to the configured MySQL database (as configured in Specific/config.system.php).</h3>");
+            die("<h3>Baïkal was not able to establish a connexion to the configured MySQL database (as configured in config/baikal.yaml).</h3>");
         }
 
         return true;
diff --git a/Makefile b/Makefile
index 2332554..ba08717 100644
--- a/Makefile
+++ b/Makefile
@@ -9,8 +9,9 @@ VERSION=$(shell php -r "include 'Core/Distrib.php'; echo BAIKAL_VERSION;")
 dist: vendor/autoload.php
 	# Building Baikal $(VERSION)
 	rm -r $(BUILD_DIR); true
-	mkdir -p $(BUILD_DIR) $(BUILD_DIR)/Specific $(BUILD_DIR)/Specific/db
+	mkdir -p $(BUILD_DIR) $(BUILD_DIR)/Specific $(BUILD_DIR)/Specific/db $(BUILD_DIR)/config
 	touch $(BUILD_DIR)/Specific/db/.empty
+	touch $(BUILD_DIR)/config/.empty
 	rsync -av \
 		$(BUILD_FILES) \
 		--exclude="*.swp" \
@@ -31,4 +32,4 @@ composer.lock: composer.json
 
 clean:
 	# Wipe out all local data, and go back to a clean install
-	rm Specific/config.php Specific/config.system.php Specific/db/db.sqlite; true
+	rm config/baikal.yaml Specific/db/db.sqlite; true
diff --git a/composer.json b/composer.json
index a61c267..1f1a12c 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
     "name": "fruux/baikal",
-    "description": "Baïkal is a lightweight CalDAV + CardDAV server based on PHP, SQLite and SabreDAV",
+    "description": "Baïkal is a lightweight CalDAV + CardDAV server based on PHP, SQLite or MySQL, and SabreDAV",
     "keywords": ["Framework", "WebDAV", "CalDAV", "CardDAV", "iCalendar"],
     "homepage": "http://sabre.io/baikal/",
     "license" : "GPL-3.0",
@@ -15,7 +15,8 @@
     "require": {
         "php"           : "^7.1",
         "sabre/dav"     : "~4.1.0",
-        "twig/twig"     : "~1.8.0"
+        "twig/twig"     : "~1.8.0",
+        "symfony/yaml"  : "^3.4"
     },
     "require-dev" : {
         "sabre/cs"      : "~0.0.6"
@@ -31,6 +32,6 @@
         }
     },
     "support" : {
-        "source" : "https://github.com/fruux/Baikal"
+        "source" : "https://github.com/sabre-io/Baikal"
     }
 }
diff --git a/config/baikal.yaml.dist b/config/baikal.yaml.dist
new file mode 100644
index 0000000..cc2c01b
--- /dev/null
+++ b/config/baikal.yaml.dist
@@ -0,0 +1,17 @@
+system:
+    configured_version: '0.7.0'
+    timezone: 'Europe/Paris'
+    card_enabled: true
+    cal_enabled: true
+    invite_from: 'noreply@localhost'
+    dav_auth_type: 'Digest'
+    admin_passwordhash: 5fe794627e1f841f8debba065e2c807a
+    auth_realm: BaikalDAV
+database:
+    encryption_key: 5d3f0fa0192e3058ea70f1bb20924add
+    sqlite_file: "absolute/path/to/Specific/db/db.sqlite"
+    mysql: true
+    mysql_host: 'localhost'
+    mysql_dbname: 'baikal'
+    mysql_username: 'baikal'
+    mysql_password: 'baikal'
diff --git a/html/cal.php b/html/cal.php
index 7242048..3a52cc2 100644
--- a/html/cal.php
+++ b/html/cal.php
@@ -24,6 +24,8 @@
 *  This copyright notice MUST APPEAR in all copies of the script!
 ***************************************************************/
 
+use Symfony\Component\Yaml\Yaml;
+
 ini_set("session.cookie_httponly", 1);
 ini_set("display_errors", 0);
 ini_set("log_errors", 1);
@@ -47,19 +49,26 @@ require PROJECT_PATH_ROOT . 'vendor/autoload.php';
 
 # Bootstraping Flake
 \Flake\Framework::bootstrap();
+
 # Bootstrapping Baïkal
 \Baikal\Framework::bootstrap();
 
-if (!defined("BAIKAL_CAL_ENABLED") || BAIKAL_CAL_ENABLED !== true) {
+try {
+    $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+} catch (\Exception $e) {
+    die('<h1>Incomplete installation</h1><p>Ba&iuml;kal is missing its configuration file, or its configuration file is unreadable.');
+}
+
+if (!isset($config['system']["cal_enabled"]) || $config['system']["cal_enabled"] !== true) {
     throw new ErrorException("Baikal CalDAV is disabled.", 0, 255, __FILE__, __LINE__);
 }
 
 $server = new \Baikal\Core\Server(
-    BAIKAL_CAL_ENABLED,
-    BAIKAL_CARD_ENABLED,
-    BAIKAL_DAV_AUTH_TYPE,
-    BAIKAL_AUTH_REALM,
+    $config['system']["cal_enabled"],
+    $config['system']["card_enabled"],
+    $config['system']["dav_auth_type"],
+    $config['system']["auth_realm"],
     $GLOBALS['DB']->getPDO(),
-    BAIKAL_CAL_BASEURI
+    PROJECT_BASEURI . 'cal.php/'
 );
 $server->start();
diff --git a/html/card.php b/html/card.php
index 1ee24a0..a617214 100644
--- a/html/card.php
+++ b/html/card.php
@@ -24,6 +24,8 @@
 *  This copyright notice MUST APPEAR in all copies of the script!
 ***************************************************************/
 
+use Symfony\Component\Yaml\Yaml;
+
 ini_set("session.cookie_httponly", 1);
 ini_set("display_errors", 0);
 ini_set("log_errors", 1);
@@ -51,16 +53,23 @@ require PROJECT_PATH_ROOT . 'vendor/autoload.php';
 # Bootstrapping Baïkal
 \Baikal\Framework::bootstrap();
 
-if (!defined("BAIKAL_CARD_ENABLED") || BAIKAL_CARD_ENABLED !== true) {
+
+try {
+    $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+} catch (\Exception $e) {
+    die('<h1>Incomplete installation</h1><p>Ba&iuml;kal is missing its configuration file, or its configuration file is unreadable.');
+}
+
+if (!isset($config['system']["card_enabled"]) || $config['system']["card_enabled"] !== true) {
     throw new ErrorException("Baikal CardDAV is disabled.", 0, 255, __FILE__, __LINE__);
 }
 
 $server = new \Baikal\Core\Server(
-    BAIKAL_CAL_ENABLED,
-    BAIKAL_CARD_ENABLED,
-    BAIKAL_DAV_AUTH_TYPE,
-    BAIKAL_AUTH_REALM,
+    $config['system']["cal_enabled"],
+    $config['system']["card_enabled"],
+    $config['system']["dav_auth_type"],
+    $config['system']["auth_realm"],
     $GLOBALS['DB']->getPDO(),
-    BAIKAL_CARD_BASEURI
+    PROJECT_BASEURI . 'card.php/'
 );
 $server->start();
diff --git a/html/dav.php b/html/dav.php
index d068b54..be51362 100644
--- a/html/dav.php
+++ b/html/dav.php
@@ -24,6 +24,8 @@
 *  This copyright notice MUST APPEAR in all copies of the script!
 ***************************************************************/
 
+use Symfony\Component\Yaml\Yaml;
+
 ini_set("session.cookie_httponly", 1);
 ini_set("display_errors", 0);
 ini_set("log_errors", 1);
@@ -50,12 +52,18 @@ require PROJECT_PATH_ROOT . 'vendor/autoload.php';
 # Bootstrapping Baïkal
 \Baikal\Framework::bootstrap();
 
+try {
+    $config = Yaml::parseFile(PROJECT_PATH_CONFIG . "baikal.yaml");
+} catch (\Exception $e) {
+    die('<h1>Incomplete installation</h1><p>Ba&iuml;kal is missing its configuration file, or its configuration file is unreadable.');
+}
+
 $server = new \Baikal\Core\Server(
-    BAIKAL_CAL_ENABLED,
-    BAIKAL_CARD_ENABLED,
-    BAIKAL_DAV_AUTH_TYPE,
-    BAIKAL_AUTH_REALM,
+    $config['system']["cal_enabled"],
+    $config['system']["card_enabled"],
+    $config['system']["dav_auth_type"],
+    $config['system']["auth_realm"],
     $GLOBALS['DB']->getPDO(),
-    BAIKAL_DAV_BASEURI
+    PROJECT_BASEURI . 'dav.php/'
 );
 $server->start();
diff --git a/phpstan.neon b/phpstan.neon
index 14a75c4..8adde37 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -8,9 +8,6 @@ parameters:
     -
       message: '#Instantiated class Flake\\Core\\Exception not found.#'
       path: Core/Frameworks/Flake/Util/Frameworks.php
-    -
-      message: '#Call to an undefined method Baikal\\Model\\Config\\Standard::getDefaultSystemConfig\(\).#'
-      path: Core/Frameworks/Baikal/Model/Config/Standard.php
     -
       message: '#Call to static method compileCss\(\) on an unknown class Frameworks\\LessPHP\\Delegate.#'
       path: Core/Frameworks/Flake/Controller/Page.php