Best Groupware?

[sentinel]

Does anyone have any reccomendations for a really good FLOSS groupware system I can run off a linux server for a small non-profit organization.

The key here is functional and free. Most of all, I need a shared calendar, but it would be nice to have shared contacts and project management.

Outlook integration is what they really want, but I don't see that as being possible for free.

I've tried or looked at a few:

http://www.opengroupware.org

http://www.zimbra.com/products

http://www.phpgroupware.org

http://www.phprojekt.com

http://www.egroupware.org

http://www.horde.org/groupware

...and others...

but I'm really curious if anyone else has tried or is using one, and if they have any reccomendations.

After personally using google calendar for so long, I have trouble seeing the usability in anything else. A php/html form just seems so clunky and inneficient for creating a calendar event.

If I can't find anything, I may end up with them on a shared google calendar, but I'd rather have something more tightly integrated that I can customize, and run and manage locally on their LAN.

Help plz?

[kickarse]

I heard opengroupware was good and there was another that was supposedly an openexchange http://www.open-xchange.com/EN/ that was to be good too...

[sentinel]

I heard opengroupware was good and there was another that was supposedly an openexchange http://www.open-xchange.com/EN/ that was to be good too...

I tried the OG.o live cd and I didn't love it. (I guess it didn't help that it was in german)

I've also looked at OpenXchange, but it seems to be a bit of a misnomer - the free version is basically useless, they take all the functionality out. http://www.open-xchange.com/EN/product/os_vs_com.html (that doesn't seem very 'open' to me, I don't think they should be allowed to use that name.)

Thanks for the reply! :)

[kickarse]

Wow that kinda sucks they cripple it like that. I'd definitely try out the openware, in english though.