Speaking of Windows Anytime Upgrade:
When Vista first came out, everything that I read about Windows Anytime Upgrade and Vista made it clear that all of the media (Home Basic, Home Premium, Ultimate) was exactly the same and that only the installation product key determined which edition was actually installed. Further, we were told that doing the Anytime Upgrade would supply us with a new product key and whatever edition we had installed would "unlock features" of the edition I was upgrading to.
Did I hear/read this wrong when Vista came out? I could have sworn this was the exact information that was described when Vista was released. Yet, when I used Anytime Upgrade to upgrade from Vista Home Premium to Vista Ultimate (and if I did so today), I had to wait a week for media, then run the installer off the new media with the new product key (as an aside, I upgraded from Vista Home Premium 64 Bit to Ultimate 64 bit, yet the Anytime Upgrade site didn't have an option to select 32 or 64, so I had to wait until the media arrived to realize that I had to call Microsoft on the phone to have them send me 64 bit media).