Nokia launched an app to get Instagram’s attention to build a Windows Phone app. Clever or annoying?

Nick Randolph at BuildMobile has authored four comprehensive posts with code snippets about using several authentication models in Windows Phone apps.

Microsoft has released the Beta 2 Refresh of Windows Phone SDK 7.1 (Mango) and also pushed and OS update for developer unlocked phones. Microsoft announced RTM of Mango update yesterday, however, this OS update is Build 7712 corresponding to the SDK release.

At the keynote at Mobile World Congress in Barcelona, Spain, Microsoft CEO Steve Ballmer announced several new features and capabilities that will make Windows Phone 7 an attractive option for even more people coming this year.