Here's a few:

Bill Workgroup Server (GPL'd :)
http://www.billworkgroup.org/billworkgroup/home

Bynari InsightConnector
http://www.bynari.net/bynari/insightcon.html

Samsung Contact (was HP OpenMail)
http://samsungcontact.com/en/

Robin

John Scherer wrote:
> Are their any email servers for Linux that emulate Microsoft exchange
> server?  What I'm after is a server that will allow groups to use outlook
> functions such as the calendar, tasks, etc...
> 
> -John
> 
> 
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