Baïkal offers an extensive web interface with easy management of
users, address books and calendars. It is fast and simple to install
and only needs a basic php capable server and MySQL or SQLite.
It allows to seamlessly access your contacts and calendars via iOS, 
Mac OS X, DAVx5 on Android, Mozilla Thunderbird and every other 
CalDAV and CardDAV capable application.

Use the baikal-apache.conf from the doc directory as starting point.
Administration is done with a web administration panel, e.g. 
https://dav.<yourserver>/admin/
Calendars my be shared by browsing to
https://dav.<yourserver>/dav.php/calendars/<user>/<calendarname>/

After upgrading to a newer version, browse to the administration panel
and follow the steps.