Originally posted by: Nothinman
There's nothing stopping you from doing that, except for the legality of the fact that you probably don't have a XP Pro or Win2k license.
He didn't mention piracy in his post; why assume that he's getting the OS in an illegal way?
Yes, it is legal to go from XP pro to 2k pro.If he gets XP Pro he can probably legally install Win2K Pro (I would still double-check since MS' licensing is so convoluted) without purchasing an extra license.