I'm testing allot with the RTM .iso. I have upgraded a Win8.1 VM, after Win10 was activated. I had not reserved me for a free upgrade, just used the RTM .iso file, and activated Win8.1 with a old Win8 retail key from MSDN. Next test was to use the same key on a different server with different hardware, and again after a upgrade started from Windows, but still, a clean install of Windows 10, Windows 10 was activated. So you can activate Windows 10 on several computers with the same win8.x key when you upgrade. The next test was to complete wipe the disk on the VM (all partitions). Then only use the Windows 10 RTM .iso file to install. And Windows 10 was automaticly activated after the installation. So this time, it had to fetch the hardware ID and/or IP, for I did use a Windows Server 2012 R2 .iso file to delete and format the disk, so nothing was spared on the disk that the new clean Windows 10 installation could use. I do not use Microsoft account on thees test either, so it had to fetch the HW ID, so that is what they said it would do, and it doing it. My last test is now to export the complete VM, with a activated Windows 10 installation on it, to a new server, then start it up. Is it a OEM win10 key I have got, it will become unactivated. If it still is activated or let me activated it, then it's a retail key. If that is the case, I want to extract the key, so I can try installing a complete fresh clean install on a different computer with the RTM .iso. but then I need a Win10 key, for it will not take Win8.x keys, I have tried that. So, how to extract the key, what keyfinder software do you think will work on Windows 10?