EXPERT RESPONSE
The only way I know how to achieve this is to use native Microsoft technologies such as Microsoft Identity Integration Server (MIIS) 2003 . That may be overkill, however.
Depending on your requirements, it's possible that the Identity Integration Feature Pack 1a for Microsoft Windows Server Active Directory (what a name!) will meet your needs. Barring that, you'll want to search for third-party tools to achieve this. A few exist. Query your favorite search engine for: synchronize gal "external database."
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