But note that a key can only be used on one PC at a time, so if you use that key for a new PC build , any other PC running that key is out of luck. Downsides of Using an Old Key When using an older Windows key to activate Windows 10, you may run into complications if Microsoft isn't sure whether you're eligible to update or not. But that seems to be happening less in recent months and years. Don't Activate Windows: I have colleagues who have used non-activated versions of Windows for years without Microsoft ever shutting it down.
Iofacture Iofacture silver badge55 bronze badges You appear to be misinterpreting the flexibility they offer people repairing their PC, granted out of necessity, with benevolence or acquiescence. OEM licensing is based on the pairing of the computer purchase with the OS purchase, so that they have identical lifetimes. Repairing the computer is one thing, replacing it is another. Given that if the motherboard were to fail, it would be a repair and not a replacement.
Medium-to-high effort: Try a Windows 7 or 8 key Microsoft Price: When Microsoft first launched Windows 10 back init offered Windows 7 and Windows 8 users a truly free, no-strings upgrade to the new operating system.
What Is Difference Between OEM vs Retail Windows 10 License - What Is Best?