I've read and found a few pretended MS-Exchange replacements, namely
Novell's OpenExchange,
OpenGroupware.org,
Open-Xchange and
Bynari.net.
What I want to know is if someone has some experience with some of these, or any other similar softwares. I need it to be free, deployed on a Linux server and compatible with MS Outlook on the clients. It should have calendar, contacts and mail capabilities, and possibly also projects, tasks, notes, etc. Calendar sharing is a must.
The most close to these requirements is
this one, but I am not sure.
Any ideas please?