In its first full month on the market, Windows 10 appears to command about 5 percent of the PC market. That's not just fast: it's unprecedented. Windows 8 took about 6 months to achieve the same penetration. Even Windows 7, a much less divisive operating system than Windows 8 that was warmly welcomed and regarded as a welcome antidote to Windows Vista, took a couple of months to hit the same level of usage.
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