We have a lot of laptops that we purchased in 2016 and then downgraded to Windows 7 Pro. We do know the product keys. However, BEFORE we install Windows 10 on each of these 9 identical laptops we must know if these product keys will also activate Windows 10. I have so far, been unable to find anywhere online, especially on Microsoft's various Windows and activation websites, where to just do a simple CHECK to see if these are also valid Window 10 product keys.
Does ANYONE know how I can check these product keys that we used to downgrade to Windows 7, even though we should have been entitled to the upgrade to Windows 10 at the time with these same keys ??? I believe we used our MS Volume Licenses we had available for distribution at the time.
Any help or realistic guidance is appreciated. Thanks !