A communication system is implemented to provide multiple application services for a group of users, where each user of the group is able to access each of the multiple application services using a corresponding computing device. For each user of the group, the communication system provides the multiple application services by generating, on the user's computing device, a user-interface that includes multiple content views. The communication system operates to maintain one or more notification aggregation view for each user account, where individual users can view notifications generated by different application services and/or for different projects.