Which Keys Activate What Versions? Geographical limits

I was hoping for a little clarification as to which keys will activate which versions.I was going to install the E version although I live in the USA.I then came across a list of activation responses while digging around W7 files.The one that caught my eye was:

"The activation server determined the specified product key has been blocked for this geographic location"

Will U.S. retail keys be able to activate E versions? Will OEM Certs be bound by geographical location? Or will the above restriction only be applied to Starter,Enterprise editions?

Hello guys,
Even i had the error on my activation of windows 7 ultimate edition, the simple workaround is to go login to your Router login url http://192.168.1.1/ (URL changes depend upon router manufacture)

login with username: admin password: password or admin

then go and disable DHCP once done click save and reboot your Modem. Once done re-try windows activation this would work perfectly.

What happens when you buy OS which has "activation on geographic locations" Microsoft check's with your ISP info, if your DHCP is on then it gives you IP as 192.168.1.3 something like that and Microsoft using that IP can't fetch your ISP details.

Regards,
ZAK
iLoVeUzAk ~ oFfIcIaL wEb sItE