http://scottge.net/2015/07/15/how-many-customers-does-microsoft-have/

As of Feb 2015
Windows
- One and a half billion people use Windows every day.
- There are over 1.7 million registered Windows Insiders. Together they’ve installed Windows 10 over 3 million times on a broad range of devices.
- There are more than 585,000 apps in the Windows Store. Hundreds more are added every day.
- Internet Explorer’s usage share on desktop devices was more than 58%worldwide in October 2014.
