My customer purchased Windows 8 and only Windows 8 Pro has the capability to join to the domain.
Windows 7 had an upgrade key which you can purchase at any store and you can upgrade Windows 7 Home to Pro.
I couldn't find anywhere if it's possible to upgrade a machine with Windows 8 to Windows 8 Pro.
I would like to know if there is any place you can purchase a key to upgrade it.
The "official" answer is to buy the "Windows Pro Pack Upgrade", which includes Media Center.
This is available in many places, including Amazon, etc.
http://www.amazon.com/Microsoft-Windows-Pro-Pack-Upgrade/dp/B0093H8W4W
Unfortunately, this is currently retailing for $66.99, or about $20 more than the "Windows 8 Pro Upgrade" that is designed for upgrading XP/Vista/7, and which comes with the ability to obtain a 'Free' license key for the Media Center upgrade.
I would expect that this (Windows 8 Pro Upgrade) could be used to upgrade "Windows 8", but have not tested this.
Why dont grab the Windows 7 to Windows 8 Pro upgrade for $19, have a look here - http://www.youtube.com/watch?v=TwgZIG_FJCs&feature=player_embedded
