New
#11
Yes, good point, Enterprise will ignore your OEM key. I'm not even sure it actually looks for them, why would it? There won't be any systems with embedded Enterprise keys.
Also, after July next year Windows 10 won't look for or use Windows 8/8.1 OEM keys. Or any Windows 7 or 8 keys. The free upgrade offer will be over. You'll only be able to install and activate with Windows 10 keys after that date.