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Market share overview
According to Net Applications[1][2] and StatCounter[3][4] data from September 2019

Desktop OS Net Applications StatCounter
older versions 0.00% 0.05%
Windows XP 1.21% 1.14%
Windows Vista 0.11% 0.25%
Windows 7 28.17% 23.25%
Windows 8 0.62% 2.32%
Windows 8.1 3.48% 4.13%
Windows 10 52.38% 47.97%
All versions 85.97% 79.10%
Mobile OS Net Applications StatCounter
older versions 0.00% 0.17%
Windows 10 Mobile 0.02%
All versions 0.02% 0.17%

References

  1. ^ "Desktop Operating System Market Share September 2019". Net Market Share. Net Applications.
  2. ^ "Mobile Operating System Market Share September 2019". Net Market Share. Net Applications.
  3. ^ Data for individual Desktop version obtained by multiplying Desktop Operating System Market Share Worldwide and Desktop Windows Version Market Share Worldwide. StatCounter Global Stats. StatCounter.
  4. ^ "Mobile Operating System Market Share Worldwide: September 2019". StatCounter Global Stats. StatCounter.