A system and method for integrating messages across multiple applications. The applications may be on one server or on several servers, and each application may service one or more e-clients. The system and method securely segregates the data for each e-client. Further, the system can be dynamically reconfigured by adding or deleting new messages and/or applications, without affecting the performance of the unchanged parts of the system. The various applications using the system need not be aware of the existence of the other applications.