A German tutorial about installation of Baïkal, using it together with Thunderbird, Android and DavX5, sharing calendars, database maintenance and security can be found [here][6]. Its focus is for people with not so much IT experience. Therefore it is very detailed, step by step with a RaspberryPI used as server.
With the same objective, a French guide, about installation on Debian, database maintenance, security and dealing with iOS clients can be found [here][7]. Its focus is also for people with not so much IT experience.