Internal Jabber server?

Has anyone run OpenFire Jabber server? We were looking at Office Communicator but that looked to be too much of a pain in the ass for licensing.

I haven’t used OpenFire, but I’ve run the official Jabber servers (v1 and v2) and ejabberd. The official ones sometimes had broken behaviour, while ejabberd just worked like it should. OF has a Java requirement, ejabberd needs Erlang. The official ones are small enough to run on your router, but setting up multiuser chat can be a pain.