Would you buy a Windows tablet that doesn't run older Windows applications?
That's the question that keeps dogging me when I see Microsoft demonstrating tablets based on ARM processors from Qualcomm, Texas Instruments, and Nvidia. Tablets with those processors will not run so-called Intel "x86" legacy software (though they will run a full version of Office 15).
Microsoft's Steven Sinofsky wrote about this on February 9. "If you need to run existing x86/64 (Intel-based) software, then you will be best served with Windows 8 on x86/64."