Yes, you can use the same Windows 7 key on multiple Windows 10 computers.
Yes, you can use the same Windows 7 key on multiple Windows 10 computers.
Yes, that's what I thought after installing another computer and noticing it had a totally different key.
Your Windows 7 activation key functions like a continuous Windows 10 license. That doesn’t mean it’s actually tied to Windows 7 forever.
I don't know about infinite, I've heard there's a limit of 10 before, but I can't confirm that. All I know is I've used my 7 pro retail key on no fewer than 4 total machines, all of which actively in use, and they all work.
It’s likely there are several contributing elements. Generally things have gone well and met expectations, yet many online discussions still share unsettling tales about Windows activation challenges from years past.