if I may ask:
What do you need simple Groupware for? I've been using Horde 4 for some time and it works great.. the "webmail" install installs a webmail, calendar, todo and contacts tool that can by synchronized with syncml/active sync on cell phones.
I finally got it also running on ISPC 3 and if you want, I could write a little howto.
"Common sense is not as common as commonly believed" by sjau