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FIM Synchronization Service encryption key
If you are patching the User Profile Service service application database, then you must export the User Profile Synchronization Service encryption key from the old database and then import the key into the new database. This key is also known as the Microsoft Identity Integration Server (MIIS) key, the Synchronization Service encryption key, and the Forefront Identity Manager 2010 (FIM 2010) key. If you do not export and then import the key correctly, the Synchronization Service will not start. To export the encryption key, complete these steps:
Use farm administrator credentials to log on to the computer that contains the old User Profile Service service application database.
Open the Command Prompt window, and then change to the following folder:
%Program Files%Microsoft Office Servers14.0Synchronization ServiceBin
Type the following command, and then press Enter:
miiskmu.exe /e D:backupFIM_Key