Abstract: Background threads are used to execute various background tasks for mobile applications that are inactive on mobile client devices. A background service monitors telemetry data of the mobile client device and interacts with an application service that provides various services for triggering and responding to the background tasks of the mobile applications. The background tasks are scheduled for execution during timeframes that have historically shown to be times that the mobile application is not actively engaged by a user. The telemetry data collected by the mobile client device may be transmitted and used by the application server to identify the presence of mobile applications on mobile computing devices, locate bugs in the mobile applications, modify shared files, move files of lesser-used mobile applications in and out of cache memory, package application download packages specific to the users of the mobile client devices, and provide application upgrades.