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It should be, even if you buy upgrade you can still use previous version. The only thins is if the upgrade had its own key. If it has one, then you can use Professional without any problem. If it does not have its own key, then you cannot use it in the same time even on different PCs.

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Q: Your friend had Windows 7 professional on and then he got Windows 7 ultimate he updated it from professional and you were wonderingif the product key for professional is good?
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