Combining algorithm of cross application shared delegated strategy object, object definition and decision

The invention relates to a combining algorithm of cross application shared delegated strategy object, object definition and decision. The combining algorithm can cross all the applications in a system to maintain a global strategy. A global strategy policy model can be managed by utilizing a messaging application programming interface (MAPI). A definition of global strategy includes a rule shared by a plurality of applications. A definition of a plurality of applications' specific strategy includes rules applied to individual application. Whether a first application is allowed to visit specific resources or not is decided based on the global strategy and a specific strategy of the first application. Whether a second application is allowed to visit the specific resources or not is decided based on the global strategy and a specific strategy of the second application.