Can XP users really switch to Linux or Mac?

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With the Save XP campaign continuing to capture momentum, and signatures, and myriad XP users facing, in the words of one such reader, a choice between “an operating system that would soon be obsolete (XP) or one that was buggy and would break much existing hardware (Vista),” both Linux and Mac desktops could be appealing right about now.

But, how realistic is a switch to Linux or Mac OS X?

Link: infoworld.com