Straight Windows 8 has both the new touch interface and the familiar Windows 7 desktop. Only if you buy the RT only version will you lose the old interface.
So the learning curve is not steep to run Windows 7 apps, yes you have a different looking start menu, but after you are in the desktop it's the same.
For RT and the metro/modern interface, yes there is something to learn, but that is only to swipe in from the edges. The right side for system stuff, the top or bottom for app functions and the left to go back. Sorry, that wasn't that steep either.
Let's face it though the new interface will not be much use to business in the short term so few should be buying RT only tablets right now. It won't replace your desktop and you'll be frustrated by the lack of full functionality - even in the web browser. Fortunately in full Windows 8 all the functionality you know and love is still there.
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