Exchange server replacement for linux

I've been given the task of allowing users to share calendars using outlook.  We run a simple pop and imap server right now.  I am looking for an exchange server replacement for linux.  I need a pop/imap server, web interface (would be nice if it would have the calendar as well), spam (pref. spam assassin), virus, authentication, etc. and allow for us to share calendars.  Does such a thing exist?

Thanks,

Traigo
traigoAsked:
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traigoAuthor Commented:
Ok, i've looked heavily over all of these.  Have you personally used any?
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traigoAuthor Commented:
How about Scalix?
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traigoAuthor Commented:
?
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PsiCopCommented:
Sorry, this one kinda dropped thru the cracks. I was traveling a lot in early December.

Never used Scalix.

Looked at NetMail fairly closely. Looks good, but it wasn't what we needed for our environment. HULA is the open-source version of NetMail.

Never used OpenExchange.

GroupWise is a good, multi-platform collaboration environment.
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