Simple groupware server recommendation

[MacDuff]

Having reached the point where we are using Ubuntu for most (90%) of our work, the next step is to get some kind of groupware installed so we can share email, calendars and contacts.

We (I) have settled on Kontact as the PIM of choice and thought that Kolab might be the easiest match but I am not sure.

We have two desktop machines, one of which would server as the groupware server as well as a regular desktop client.

We have two laptop computers which connect via wireless LAN.

We do NOT require the capability of having access to the office computer from outside of our LAN.

It would be overkill to run a dedicated server for the little bit of traffic we generate.

Any suggestions for a simple to install and maintain groupware server would be appreciated.

Thanks
Mac

[FreakTech]

You should try out Citadel

http://www.citadel.org/doku.php

[MacDuff]

You should try out Citadel

http://www.citadel.org/doku.php
Thanks FreakTech, I had a look at Citadel and it looks good but I did a trial install which seemed to go OK but it would not run and when I tried all the trouble shooting suggestions on the support pages, none of them produced the expected results.

The machine that I tried it on has had many applications installed and removed as I try out things to see if they will work for me. It is probably about time I cleared off the drive and did a fresh installation of Hardy.

The Citadel site did not seem to have a version for Hardy. Do you know if the version for "Gutsy" will work with "Hardy"?

Thanks
Mac