(The achievements of Windows Mobile 7 have made Microsoft's mobile device business in decline. It can be said that the barren use of software and the monotonous and astringent operation interface have made it impossible for consumers to start. Many loyal users in Windows Mobile 5.0 and even CE era have moved to other platforms. The lack of many important elements, such as low hardware utilization, poor streaming media playback support, and imperfect communication system, has caused Windows Mobile Phone's banner to collapse.)