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According to the chart on that site, Windows 7 is still at 44%.

That very much sounds like "not being able to overcome past Windows versions in market share" to me.

Nope. Look at the graphs for Windows 7 and Windows 10(assuming that's the dotted line) over the whole recorded time starting in 2008. Windows 10 is roughly following Windows 7's trajectory, if not exceeding it a little bit. It took Windows 7 over two years to initially reach 44%. Windows 10 has been out for only about a year now.

Forced upgrades help move the installed line up, (but move the pro-Microsoft line down).

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