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I'm not sure about all of the differences, but there are certainly enough to warrant waiting for Windows 8. Remember that RT was designed to run on the kind of ARM chips that smartphones use. There are quite a few applications that Windows RT cannot run, like anything but the newest versions of Office. Hardware support differs between the two as well. RT also limits your software choice to things you can download from the Windows App Store, or whatever they call it. Let's see, what else: RT doesn't Windows Media Center or Windows Media Player, which is kind of a big deal for a media consumption device.