You can't run W2K server as a workgroup, it has to be an AD controller. The clients can be in a workgroup, but then why bother with W2K server...

Are you using W2K professional as a Peer 2 Peer server? That can be put in a workgroup.

Oh well, for just file sharing and maybe print sharing, I recommend Samba 2.2 for any distro of Linux. Its fast and convenient. I have a W2K server at home & a Linux server, they both work well except my Linux server has about 60 gigs free so I use it more for storage. The W2k has like 4 gigs free... Time to build a new server...