When Active Directory designs encompass multiple forests or when the design has to account for mergers and acquisitions, the Microsoft Metadirectory Services (MMS) tool can be invaluable in keeping directories in synch. MMS, now called Microsoft Identity Integration Server 2003 (MIIS 2003), enables you to integrate and manage identity information across multiple directories. These directories can be different systems or platforms. MIIS 2003 adds functionality to Active Directory by providing enhanced interoperability capabilities. These capabilities include integration with a various identity repositories, synchronizing identity information across multiple systems, managing changes of identity information by automatically detecting updates and passing the changes across systems as well as managing passwords. Prudent use of MMS enables you to keep an entire enterprise of various directories in sync by managing them through a single authoritative source.
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