Sharing Outlook calendars via FreeBSD?

[Nejc Skoberne]

Hello,

I am using a FreeBSD 5.3 server in a company with approx. 30
users. There is also a Samba server as a PDC and a mail server.

The users would like to share their Outlook calendars. What
are my options regarding having FreeBSD as a platform to do this?
OpenGroupware is just for Linux and I can't find any
documentation how to put it on FreeBSD (the linux-opengroupware
port expired last year).

Thanks,
Nejc