Windows 2000 Professional - 2 CPUs
Windows 2000 Server - 4
Windows 2000 Advanced Server - 8
Windows 2000 Datacenter server - 16-32

Thanks for the rundown! And thanks to everyone else for the info. I'll have to study up.

I haven't hooked the thing up yet, but I thought I'd offer the specs based on what I found after opening it up and looking at some jumper settings. It currently has two of the 4 processor slots occupied with 500MHz P3 Xeons. If I wanted to max this out I don't suppose it would be much of a problem, though it's tough to find these processors anymore. By the time I have the money, this guy might not have his stock available anymore.

Anyway, I'm still trying to figure out how much RAM is in it. 4 of the 16 slots are occupied, but I don't know how much each stick is. So it's safe to say that there's either 512MB or 1GB.

The other unfortunate thing is that nobody seems to know where the key is, and without it I can't unlock the drive bays to even see what's in there, let alone add or replace anything.

Well, I can't wait to get started setting this thing up.