Following a brief stint in private beta, BlackBerry has today announced that its popular BlackBerry Messenger (BBM) app_is now available for all Windows Phone 8 users. The company said it has tried to pick up on Windows Phone’s_own specific UI design, so the app looks a little different compared to its incarnation on other platforms, although it does obviously provide many of the same core features found on the iOS and Android apps. You can check out a full walkthrough of the Windows Phone 8 beta build for more details on the differences.