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Event ID: 9551 Source: MSExchangeIS

Source
Level
Description
An error occurred while upgrading the ACL on folder <folder name> located on database "<name>".
The Information Store was unable to convert the security for <distinguished name> into a Windows 2000 Security Identifier.
It is possible that this is caused by latency in the Active Directory Service, if so, wait until the userrecord is replicated to the Active Directory and attempt to access the folder (it will be upgraded in place).If the specified object does NOT get replicated to the Active Directory, use the Microsoft Exchange System Manageror the Exchange Client to update the ACL on the folder manually.
The access rights in the ACE for this DN were <number>.
Comments
 
See ME814075 for a hotfix applicable to Microsoft Exchange 2000.
As per MSEX2K3DB, this error is related to the appearance of zombie users. Zombie users are users that appear in an Access Control List (ACL) but not in Active Directory.

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