OS X doesn't prove that. OS X proves that, to sell into the personal market, you need Microsoft Office - specifically that, not "compatible," "equivalent" or even "better than." If you do, you have a shot. At that point other things start to matter. If you don't, fugghedaboutit except for a few geeks*.

OS X has MS Office. Linux doesn't.

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*I write this as a certified geek, who taught UNIX stuff in a prior lifetime and who wears the label proudly.