Upgrade to Windows Vista XP key Will be Invalidated

Many people are worried about upgrading to Windows Vista for the fact that on previous versions of windows there has been many bugs, so many people may wait a few months first but then others will just want to get it because its new.
Well to add to that fear:
If you choose to purchase an upgrade version of Windows Vista to upgrade Windows XP, you will no longer be able to use that version of Windows XP.
Not as a dual-boot option or on another system, because the key will be invalidated, preventing you from activating it.
Via Microsoft

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