I recently had a run in with a few Vista machines on a side job i did. They got themselves a 2003 server so they wanted to update their network for better permissions and things so I suggested to create a domain so that all users accounts are handled by the 2003 server. Firstly, none of the PCs they had were Professional or Business edition. So they did that.
Then I couldnt get the Vista machines on the domain.
I had to configure the 2003 server as the DNS server in order for the Vista boxes to join.
SO, that 2003 Server turned into a Domain Sever, DNS Server, and DHCP server within a few hours.... CHA CHING! for me, but it was a learning experience and I would have been out of there sooner if it wasnt for Vista.
So that was pretty much dumb