When Upgrading from Windows 7 Home Premium to Professional...

Here is my case. I've performed a upgrade to Windows 7 Home Premium couple days ago, and bought another upgrade to Professional yesterday. After I installed Professional via "Windows Anytime Upgrade", I change the product key to the "NEW" professional product key.

Question is Would I still be able to use the "Old" product key (Home Premium) to upgrade another computer?

or did I just waste that Home Premium Product Key (since I don't need 2 version of Windows 7 running on one computer)


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