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Event ID: 9525 Source: MSExchangeIS

Source
Level
Description
The Microsoft Exchange Information Store was unable to look up the GloballyUnique Identifier for: <distinguished name>. The error code is <error code>.
Comments
 
As per Microsoft: "A failure from querying the directory service may have occurred. This could have been caused by communications problems with the domain controller". See MSEX2K3DB for additional information about this event.
You Cannot Install a Second Exchange 2000 Server in an Exchange 2000 Server Site and Event ID 9525, 1121, and 5000 Error Messages Are Logged.
ME305392 says "This issue may occur if authenticated users do not have read access in the Domain container or in the Configuration container in Active Directory" and provides a fix.

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