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Event ID: 8251 Source: MSExchangeAL

Source
Level
Description
Could not read entry '<object name>' on directory <directory name>. Cannot access Address List information. Make sure that service was installed properly. <name>.
Comments
 
As per Microsoft: "This event indicates an inability to read a named object in Active Directory. This could be because of lack of permissions, inability to communicate with a domain controller/global catalog, or a misconfigured Domain Name System (DNS) server". See MSEX2K3DB for more details.

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