If it is not forced in the process, it is certainly the intent of the
upgrade license. Of course, if you install Vista on a PC that had an OEM
license of XP, they're tied, in effect, anyway. The OEM license of XP can't
be transferred to another PC, and the Vista license, once installed, can
only be transferred once.

Dale

"David Wright" <DavidWright@discussions.microsoft.com> wrote in message
news:ADE44CB2-93CC-46E0-A881-7D50802560FF@microsoft.com...[color=blue]
> If you have the full version, then I would suggest keeping Vista and XP
> separate. AFAIK, if you upgrade XP to Vista, then the XP and Vista become
> locked together, meaning that you couldn't then take the XP disc and
> install
> it on another machine. I might be wrong about this, so hopefully someone
> will correct me if I am wrong about that.[/color]