Groupware packages -- recommendations?

[Randy Edwards]

    I'm taking a look at various groupware packages and Exchange-like 
replacements.  After looking at various packages, I'm seeing just what I 
expected: some web-based systems are about ready for prime-time, but there 
isn't a huge variety that are highly polished, and ready to drop on an 
unsuspecting Windows user (read: with or without an Outlook client).

    IMHO, the best I've turned up so far are PHPGroupware and PHPProjekt, with 
Sherpath (you can reference all on Freshmeat.net) looking interesting also. 
All three are modular web-based systems.  PHPGroupware and PHPProjekt are to 
the level to where now third-parties are writing modules to their APIs, either 
to bring in new functionality or to replace existing modules with modules 
incorporating new functions and features.

    Another interesting possibility is Samsung's Contact.  That package seems 
sane for an Exchange replacement, but the ~$1500 server fee, client licenses 
and typical commercial licensing makes it something I'd like to avoid, if 
possible.

    My question is, what packages (preferably free, but other licenses might 
work) are there out there which would work with a user to provide e-mail and 
group scheduling, along with other groupware-type tasks?  Anything out there 
that I should be sure to look at?

-- 
  Regards, | What's "free" software? - Free speech? Free beer?
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  Randy    | http://www.fsf.org/philosophy/free-sw.html