Microsoft promised recently that Facebook Messenger would arrive on Windows Phone soon, and the dedicated app is now available in the Store. While Windows Phone has always had built-in Facebook messaging, the new Messenger app supports features like group chat, stickers, and picture messaging. While it has taken some time to launch on Windows Phone compared to iOS and Android, the dedicated Facebook Messenger arrives just ahead of a key Windows Phone 8.1 update. Microsoft is planning to step back from some of its key Facebook integration in the upcoming update, allowing Facebook to provide similar functionality within its own apps.