[Kroupware] best distro for kroupware?

[Cies Breijs]

So hypothetically: I'm reinstalling and for this 2 modest pc's i don't really 
care what type the distro. But the thing i want smoothest (first time 
experience and in the future) is my kolab-oration...

What's the best distro for:
- the kolab server
- KDE's kolab client (unstable kontakt or unstable kmail-imap) 

Resons count best...

Flame-on!

Cies.