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Event ID: 8284 Source: MSExchangeAL

Source
Level
Description
The Recipient Update Service could not find the Address List Root which is located in the Exchange Service entry under the attribute addressBookRoots. This might have been caused by a permissions problem.
Comments
 
As per Microsoft: "This event indicates that the Recipient Update Service could not find the Address List Root object (addressBookRoots attribute of the MicrosoftExchange object in Active Directory). This could be because the Recipient Update Service is configured to communicate with a domain controller/global catalog that is no longer available, has been demoted, or has invalid configuration information". See MSEX2K3DB for more details.
The Recipient Update Service had an incorrect domain controller listed. We had removed a Win2k domain controller and the Recipient Update Service (Enterprise Configuration) and (Domain) had the old controller listed. The fix was to go into exchange system manager, Recipients, Recipient Update Services, properties on the Recipient Update Service (Enterprise Configuration) and change the domain controller to a valid domain controller. Then right click and rebuild. This has to be done for the local domain as well.

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