Win2K is still MS's answer to an industrial strength OS for corporate use, and WinXP has a long road ahead of it. I see no reason for anybody (other than laptop/remote users, just because of remote desktop and all of the improved power management features) in the corporate world to run to WinXP. Plus, Win2K with SP2 worked really, really well for me (hell, even SP0 and SP1 were fine too) as a desktop solution, and SP2 fixed a good deal of AD related issues that made it more reliable.