Windows Phone 7 The Start screen in Windows Phone 7. Company / developer Microsoft Corporation OS family Windows CE Working state Released Initial release NA November 8, 2010EU October 21, 2010 Latest stable release 7.0.7004.0 (October 21, 2010; 3 months ago (2010-10-21))[+/−] Latest unstable release 7.0.7338.0 (December 1, 2010; 58 days ago (2010-12-01))[+/−] Supported...
