Identity is a key component of a hybrid environment
RESTful Interface to Windows Azure Active DirectoryProgrammatic access to Windows Azure Active Directory Objects such as Users, Groups, Contacts, Tenant Information, Licensing, Roles, Support Links such as Member, memberOf, Manager, DirectReportRequests use standard HTTP methodsGET, POST, PATCH, DELETE to create, read, update, and delete directory objects. Response support XML and JSON, and standard HTTP status codesCompatible with Odata V3Will use OAuth 2.0 for Authentication and Role Based Assignment for Application and Users, for Authorization