Kolab is a free and open source groupware server and client solution with excellent capabilities for managing emails, contacts, calendars, etc. It is a near drop-in replacement for Microsoft Exchange Server or Gmail. The source code of Kolab is available under the GPL version 2 software licence. The webmail component is Roundcube.
- How to install Kolab on ClearOS
- How to Install Kolab on CentOS
- Synchronization of the address book on Android, via CardDAV
- Aaron Seigo: http://hackerpublicradio.org/eps.php?id=1958#Kolab
- Robin Edgar: http://hackerpublicradio.org/eps.php?id=1699 (scroll to Kolab, MyKolab, Roundcube)