XP key still usable after upgrading to Win 7?

Hi,

I want to upgrade from XP to Win 7 by buying Win 7 upgrade version.  Can I still use my XP and XP key after install Win 7 upgrade??  I may use both XP and Win 7 if possible.  Thx.

The official answer is: NO

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Practically YES
Lawfully NO

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Thanks guys. That's good enough.

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