With Windows 7, there were six versions, but only three you had to pay attention to. Now, with Windows 8, you'll have to pay attention to 3 of 4 ... and one of them, you can't buy on its own. Got that?

Oh, and one version is called Windows RT, which does not stand for Windows Retweet. But it should.

Windows RT runs only on ARM-based processors, and it won't run legacy, x86 desktop apps. So much for Microsoft's whole "no compromises" message ...
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