Originally Posted by DuckieHo
That is WRONG.
OEM licensing is different from retail.
OEM allows it to be installed on one machine. A definition of machine isn't clear and MS uses a secret formula to determine (based on components) what comprises a machine. A motherboard swap will trigger a check though. Retail allows for a single install instance at any given time. This does allow the license to be transferred to other machines.
Yep, that is why I recommend the Upgrade, it is a transferable license, and all you need is a valid license for a previous version for it to be legit, and almost everyone has that.