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on Nov 17, 2015

One would presume that OEM product keys will also work. For example, a Dell machine with a Dell supplied operating system that has been activated has a product key that can be retrieved with various programs such Belarc Advisor.

Has that been verified to work?

on Nov 17, 2015

I have not verified it but it should work on the same hardware the key is tied to in the BIOS - just like when you were getting the Digital Entitlement activation.

on Nov 17, 2015

Can an existing, activated Windows 10 Home be upgraded with a Win 7/8 Pro key?

on Nov 19, 2015

@ gelat

I haven't personally done this, but at some point I am going to try it, definitely. My guess would be that your Win7/8 key will work on upgrades & clean installs alike--definitely. Looks like he covered it in the gallery if not in the article.

on May 21, 2016

The information here in this article is true and correct, as is the statement to this effect on Microsoft's Win10 download page; oddly though, I just did a clean install of 10Pro using my 8.1Pro upgrade key, using media prepared on a USB key (since I could not reliably clone my failing HDD with mature 8.1)... When I launched the Win10Pro installer, it insisted that if this was a clean install, I would need a purchased Windows 10 key! I kept going though, and when it asked for it, it did indeed accept my 8.1 upgrade key.
Just another example of how sloppy MS can be with their distributions and info.

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