In my case, I have a single PC with two removable SSD's.
One SSD has Win 7 Pro (OEM) installed, and the other has Win 8.1 Pro (Retail).
I insert the appropriate SSD and boot to the OS required at the time.
If Windows 10 is really the best of Windows 7 and 8 combined, then I shouldn't need 2 OS's. This will leave me with a spare Full Retail OS for use on a future build, which I would obviously prefer to be the new Windows 10 if possible.
I believe I can do the following legally;
a. Upgrade Win 8.1 Pro (Retail) to Win 10 Pro using the free upgrade offer. It should retain its "Retail" status.
b. Uninstall the upgraded Win 10 Pro (Retail) and set the license aside for transfer to another PC (ie For use on a future build, probably after the free upgrade offer has expired)
c. Upgrade Win 7 OEM to Win 10 using the free upgrade offer, and use this on my current PC
Can anyone confirm yes/no to the above?
As far as I can see Microsoft just keeps repeating rhetoric such as "the upgraded OS will be free to use for the lifetime of the device" which seems to indicate my Retail status might be reduced to OEM.