Introduction
Windows Phone store 8.1 introduces an important change in the Windows Phone developer ecosystem. In this release, Windows Phone converges with the Windows Store apps platform into a single developer platform that runs the same types of apps i.e Windows Runtime apps.There is lot of changes included between windowsphone 8.0 and windowsphone store 8.1 .Like windowsPhone 8.0 there is no Launchers and Choosers available in windowsphone store 8.1 ,as well as namespace "Microsoft.Phone.Tasks" is no longer available in store 8.1 OS.
