Before Windows Phone 7 was even an embryo of a concept, Windows Mobile was king: It powered nearly half of smartphones in use, a led the industry in features. Then, in 2007, things started to go wrong. Very, very wrong.
Silicon Alley Insider has charted Windows Mobile’s platform share, which is to say the proportion of users who were using it at a given time, over the last four years. For showing decline, figures like these are more telling than sales—they mean that, for years now, people haven’t been buying Windows Mobile phones nearly as fast as they’ve been ditching them.