Quote:
Originally Posted by kennyc
I wonder if that means it would not work on a different system due to the system information being stored at MS....hmmm.
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Probably not
From
TenForums
If you upgraded to the free upgrade of Windows 10 from an activated Windows 7 or 8.1 PC, then you will not have a product key. Instead, the PC gets registered on Microsoft activation servers to be able to activate Windows 10 with instead.
You do not get a product key with the free upgrade of Windows 10. Instead, it's just a generic key for installing that cannot be used to activate with.
If you make a meaningful change to your hardware, you may need to contact customer support to help with activation.
The activation for the free offer of Windows 10 is registered on the Microsoft activation servers, and is referenced by the hardware (motherboard/CPU/graphics card) of the PC it was upgraded on.