Abstract: Various embodiments herein each include at least one of systems, methods, and software providing a message-oriented middleware infrastructure to integrate messaging between entities, such as software systems, processes therein, and other elements that may be connected to a network. Such embodiments may include pushing messages directly to entities upon receipt of a message or storing a message in an inbox for later retrieval. Additionally, various embodiments handle both message format transformations and message target determinations thereby alleviating considerable efforts to customize each constituent, integrated entity through one or both of custom coding and configuration.