[ale] Is there an open source product similar to Exchange?

[ale-bounces at ale.org [<a rel="nofollow" href="mailto:ale-bounces">mailto:ale-bounces</a> at ale.org] On Behalf Of Ryan Fish]

Hello,
 
Is there a free open source product similar to Exchange that provides access to mail, shared calendars, etc.?  If so, where might I find information on it?
 
Thank you.
-Ryan

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<ul><li><em>From:</em> FishR at bellsouth.net (Ryan Fish)</li></ul></li>
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