Half sure, 90% no.

There are over 2.5 billion active Android devices (https://twitter.com/Android/status/1125822326183014401). There were over 700 million active iPhones in 2017, likely more today (https://fortune.com/2017/03/06/apple-iphone-use-worldwide/). So conservatively there are over 3 billion smartphones.

Microsoft claims there are over 1 billion Windows 10 installations (https://news.microsoft.com/bythenumbers/en/windowsdevices/) and over half are running Windows 10; so that means that less than 2 billion Windows installations are in existence.

The numbers are pretty clear at this point.

> So conservatively there are over 3 billion smartphones.

> so that means that less than 2 billion Windows installations are in existence.

In what world is 3 billion out of 5 billion >= 90%? I repeat "Half sure, 90% no."

I think I misread the GP. I interpreted it as a claim that someday, Windows won’t have a 90% market share.