Will the Surface tablets be able to run Windows 7?
Although the Windows RT has a desktop mode as well, Microsoft said that the Desktop Mode of Windows RT will only be open for a few select programs from Microsoft itself. However it is possible that third party developers could feasibly develop ARM applications.
I realize I sidestepped the question. If I were to speculate. I would say no for the RT (ARM platform would not play nice with Win 7) and a "maybe but why would you do this?" for the pro.
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The fringe question is whether Microsoft will lock down the Surface for Windows 8 Pro with the UEFI Secure Boot feature. On Intel-based systems made by third parties that want to use the Designed For Windows 8 logo, Microsoft requires Secure Boot to be enabled by default but also requires user-accessible options to turn it off or load custom certificates. It remains to be seen whether Microsoft holds themselves to the same standard.