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I'm using Windows 7 Home version. Recently I switched to Windows 7 Ultimate. Can I use the same product key that was given for Windows 7 Home version in newly installed Windows 7 Ultimate?

If so, can I switched back product key again to Windows 7 Home in future.

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  • Simply put, no. Key's are tied to SKUs so a new SKU will require a new Key. Sep 16 '15 at 14:45
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AFAIK each key is only valid for its specific version. (and possibly it's architecture, not sure about this one)

Example : If you upgrade from W7 Home to W7 Professional you need to buy a new key.

So no, it not a valid solution.

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No, You can not buy a Windows 7 Home Premium license for $80 and then use it for a Windows 7 Ultimate installation where the license normally costs $380

But you can use Windows Anytime Upgrade provided you have a Windows 7 Ultimate license key.

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  • Wait... Shouldn't you be saying you can use windows anytime upgrade provided you have a valid win7 home premium key? If you have a win7 ultimate lisc already what would you be upgrading to? @ramhound
    – Tyson
    Sep 16 '15 at 15:31
  • @Tyson - If you have a Windows 7 Home Premium installation you can then upgrade that installation to Windows 7 Ultimate, provided you have a Windows 7 Ultimate license key. The process to upgrade a Home Premium installation to Windows 7 Ultimate is not free.
    – Ramhound
    Sep 16 '15 at 16:02
  • I understand what you mean now... I was aware it wasn't free but the wording tripped me up. @Ramhound
    – Tyson
    Sep 16 '15 at 16:04

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