1. A method to centralize identity management, the method comprising: retrieving locally managed identities from at least one server; merging the locally managed identities with centrally managed identities according to a plurality of rules; creating an identity map that maps the locally managed identities to the centrally managed identities; communicating the identity map to the at least one server; and reassigning resources of the locally managed identities to the centrally managed identities in accordance with the identity map.