A method and a system are presented in which computing environments of different enterprises interact within a federated computing environment. Federated operations can be initiated at the computing environments of federation partners on behalf of a user at a different federated computing environment. A point-of-contact service relies upon a trust service to manage trust relationships between a computing environment and computing environments of federation partners. The trust service employs a key management service, an identity/attribute service, and a security token service. A federated user lifecycle management service implements federated user lifecycle functions and interacts with the point-of-contact service and the trust service.