BlackBerry can not get back market share just like Windows Mobile. Not going to switch back.
Windows Mobile used to sell 14 to 20 million licenses a quarter so they did have some history. I give you that Windows had a terrible mobile platform. Windows Mobile had big enterprise marketshare of maybe 30%-40% behind BlackBerry. Windows Mobile was not used much in consumer space. BlackBerry also was big in the enterprise. When iPhone came along, BB started targeting consumers.