Correct. NT was a "ground up" OS (for the most part) and everything later came from that.
The 16 bit to 32 bit to 64 bit transitions were pretty cranky. Thunking sucks.
It got a lot better with the Windows Server 2000 / Windows 7 world.
We shall see how this goes. But I'm gonna wait till the dust settles.
Like maybe next week.