The Windows Insider program allows Windows Phone users to test the mobile version of Windows 10. At Build 2015 last week, Microsoft announced that it now has 3.7 million subscribers in the program. Just a few months ago, the program held 2 million Windows Phone users so you can see how fast the Insider program is growing.
Microsoft is craving for feedback on Windows 10. With nearly 4 million users able to test the mobile Windows 10 build, this should provide the guys in Redmond with enough comments to know whether they are on the right track, and if any changes need to be made.
