Examples of the present disclosure describe systems and methods of managing user tasks using isolated collections of data. In aspects, input may be received by a task management application/service. The task management application/service may analyze the input to determine isolated collection of resources identifying tasks associated with one or more user accounts. The task management application/service may aggregate and analyze the tasks to determine associations between the tasks, to classify tasks and/or to prioritize tasks. The task management application/service may use the analyzed data to provide notifications, prompt user action and/or provide query results. In aspects, the task management application/service may also provide an interface comprising a single master view of tasks aggregated from disparate data stores and/or user accounts associated with a user.