Answer Best answer as chosen by user ccjgrant I've been doing it since Feb. this year
On my test PC desktop I have XP, Win 7 32 bit, Win 7 64 bit, and Win 8 Pro all on the same physical 500 GB hard drive. I've installed 3 versions of Win 8 in the same partition, now having the released upgrade version I downloaded for $39.99. The two earlier ones were the pre-release ones. In September when I had one of the pre-release versions of Win 8 installed, I installed a fresh new copy of Windows 7 64 bit Home Premium with no problem. All of this is on the same hard drive.
When you install Windows 8, it will update the BCD (Boot Configuration Data) to make Windows 8 the default, but you can still boot to the other OSes, and you can go to the System applet of the Control Panel and set the default boot device to one of the other ones if you wish.
Since I never read the EULAs (does anybody?), I could be violating something, but technically I haven't had the first problem of any kind with this setup.
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