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past experience with MS product keys is they apply ONLY to the specific
version of the software you got - thus Win 8 Pro is a different key series to Win 8, and the same would apply to the bit type as MS see Win 8 32 bit as a different version to Win 8 64 bit.
To: Deadly Ernest 28th Dec
Actually, when you buy Windows 8 Pro you receive both the x86 & the x64 DVD's; you use the same activation key for both DVD's. Maybe Win8 Pro will be available as single DVD's, an x86 & x64, but MS doesn't appear to be doing things the same as in the past at all.
Ignoring the touch screen functions, I have found that the keyboard and mouse continue to work well with all Win8 Pro functions, as in past Ultimate versions.