No. OEM keys will not activate retail copies of Windows. Also, I am not sure what you mean by an unactivated Dell key. With Windows 8 they started putting those in the UEFI, and all activation is done ...
Ugh this kinda sucks but I guess it doesn't really matter. I had a bunch of Windows 7 keys from 2009 that have been great with 10 and 11. I get that this free ride is over but it still sucks. It ...