OEM keys are not generic unless they are purchased in huge lots (like Dell would do) in a bulk licensing agreement.
All my OEM licenses have different keys.
I did the upgrade (I didn't make an ISO) so it never asked my for a key. I assume it used my existing Win 7 OEM key. When I look in the activation details, it shows the key I received from Microsoft for the free MPC update.
Cloud (noun, singular): A dynamic arrangement of multiple potential single points of failure, with a user at one end and their data at the other.
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