A system and method for cross-authoritative, user-based network configuration management is provided. Users log-in to a network using any device coupled to the network, and an identity manager may provide the user with a custom computing environment by verifying the user's identity and identifying content, assignments, and other configuration information associated with the user. For instance, the identity manager may retrieve a unique identifier assigned to the user, query one or more authoritative source domains based on the unique identifier, and deliver a computing environment assigned to the user. By seamlessly integrating multiple authoritative sources, administrators can make assignments to users across multiple authoritative source domains, and queries to the sources will always be up-to-date without having to perform synchronization processes.