The upgrade versions require you to have Windows XP or Windows 2000 already
installed on your computer, the full versions do not.

"Revenger" <Revenger@discussions.microsoft.com> wrote in message
news:3629B906-FA3A-4849-A8D4-8A916D744887@microsoft.com...
> What's the difference between the windows vista(home,business or ultimate)
> and upgrade windows vista? Has the complete version(ex. Ultimate) more
> functions than upgrade one(Ultimate)? If yes, What are those functions ?