Windows 7 OEM Upgrade

This is prob a silly question but I currently have Windows 7 Professional 64Bit installed on my computer. If I were to buy a fresh copy of Windows 7 Ultimate would that free up the Windows 7 Professional Serial?

Best Regards
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  1. It will only free it up if it is a retail version. OEM versions are tied to the motherboard that they are first installed on.
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