- Important dates regarding apps with Windows Phone 8.x and earlier and Windows 8/8.1 packages submitted to Microsoft Store | Windows Developer Blog https://blogs.windows.com/buildingapps/2018/08/20/important-dates-regarding-apps-with-windows-phone-8-x-and-earlier-and-windows-8-8-1-packages-submitted-to-microsoft-store/#PCPhHdxUh08wFDjj.97 8 comments windowsphone