It is agreed that it is the most widely used on the desktop.
It is not agreed that it is the most widely used on servers of all sizes.
From there it is how did MS get EVERYWHERE? Marketing, leveraging, and strong-arm tactics.
IBM had no idea how to market OS2 Warp and you couldn't just walk into a store and buy it. Dispite being more stable with identical functionality and feel, it didn't matter because you just couldn't easily get it. (big blue was a big mess back then)
The introduction of *nux to the mix is for another time, another place.
(I cencored my other post, just for you!)

































