Native Directory contains information that references user and group identities defined in many external user directories. For example, Native Directory groups can contain users defined in external user directories. Changes in external user directories, such as the deletion of a user account or the migration of users from an external user directory to another (see Migrating Users and Groups Across User Directories) may cause stale data within Native Directory because EPM System security is not synchronized to be aware of such changes. In such cases, use Update Native Directory Utility to identify and remove stale data from Native Directory.