Net apps got popular because they've been arround and update regularly for a while. Look at the OS Marketshare article in wikipedia for a list of others.
But anyway, much of those Windows 7 hits are prolly from pirated copies...as he says, that the marketshare in US is lower than "the world".
Also, off the top of my head, 10% is like maybe 150-200 million instalations (given 1.7 bil internet users). But Microsoft just announced that they sold 60 million liscenses, So even if Net app is right, that means that most of the installations are likely from China or somewhere.
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