Just stumbled across this - I assume it means for "new", "this is the 1st time THIS copy of Windows has ever been installed" - but I suppose I should go back and re-read my license - I don't think it contains language allowing MS to change the rules later - but
************* New MB = new windows license
"Microsoft recently made changes to the license agreement. A new motherboard is now apparently the equal of a new computer, and if you upgrade it you need to purchase a new Windows license. Microsoftââ¬s new policy states: An upgrade of the motherboard is considered to result in a ââ¬Ånew personal computerââ¬Â to which Microsoft OEM operating system software cannot be transferred from another computer. If the motherboard is upgraded or replaced for reasons other than a defect, then a new computer has been created and the license of new operating system software is required.
motherboard upgrade Microsoft license policy OEM operating system software Windows license
The reason Microsoft gave for this term is that Microsoft needs to have one base component "left standing" that would still define that original PC. Since the motherboard contains the CPU and is the "heart and soul" of the PC, when the motherboard is replaced (for reasons other than defect) a new PC is essentially created.
Microsoft has sent a memo to its OEM partners asking them to enforce this new policy every time they upgrade a computer for a client.