Computerworld - https://www.computerworld.com/article/3199373/windows-pcs/windows-by-the-numbers-windows-7s-recalculated-share-shows-faster-than-thought-decline.html#tk.rss_all
Windows 7 dropped below the 50% user share mark last month, finally ceding the operating system majority on Windows PCs.
Ironically, the decline of Windows 7 was good news for Microsoft, which wants customers to move to the newer Windows 10 as soon as possible.
According to analytics vendor Net Applications, Windows 7’s November global user share fell 3.5 percentage points, ending the month at 43.1%. November’s plunge was the largest ever for the OS that debuted in 2009.
When only Windows personal computers were included in the calculation, Windows 7 ran 48.8% of all Windows machines, a month-over-month drop of 2.6 points.