3rd world (and Europe) average user still uses Windows as main OS. When you're in contact with only coders/devs you'll see a lot of Linux and macBooks but outside that small bubble Microsoft rules.
Desktops in most applications are locked down to the point where they're dumb terminals to run Office and a browser, this is where MS rules, or creative/technical workstations, where Apple currently has a better story and is the only desktop maker growing market-share for the past couple years.