Key milestone reached for WIN10:

https://redmondmag.com/articles/2020/03/16/windows-10-reaches-1-billion.aspx

https://blogs.windows.com/windowsexperience/2020/03/16/windows-10-powering-the-world-with-1-billion-monthly-active-devices/

Microsoft announced on Monday that Windows 10 is now on more than 1 billion “monthly active devices.”  The 1 billion number is noteworthy for being a goal that Microsoft had set for itself back in 2015, when Terry Myerson, then-executive vice president for Windows, had predicted it