Stat, the corporate version does not have the "product activation" hassle built into it.
XP Home certainly does, and Pro does in most cases as well. It's a royal pain if you own a laptop, as occasionally Windows XP will decide you've made too many changes and decide to block access to all your programs until you reactivate.
I will NEVER put any Microsoft software on my system with product activation. Should they continue this policy I'll just switch to linux for work purposes (it's better anyway) and try to keep my "old" Windows 2000 box up and running for AH and games.
