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Actually its not illegal, if you purchase it. Steve wont give a damn what you run it on, as long as you buy it. As is the case with Gates im sure -- otherwise there would be no such thing as bootcamp or parallels. Or at least they wouldn't be products that are advertised on the Apple website.
Actually, running any Mac OS on other than a genuine Macintosh computer is against the EULA.

And I would imagine that SJ would prefer that you purchased a Mac and not just the OS since Apple makes most of their money through hardware sales.
 
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