I'm far more interested in Mac OS (all forms) vs. Windows OS (all forms) battle.
Mac OS has been growing steadily, and as has been mentioned, thus far Windows 7 hasn't seemed to have blunted the progress. Of course, this progress is coming at 1-2% adoption per year, but add that progress up over a decade, and Mac would suddenly have 1/4 to 1/3 marketshare.
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