There are two or more well-known objects that have the same security identifier (SID) attribute in the Security Accounts Manager (SAM) database. The newest account will be kept, and all older duplicate accounts will be deleted.
This is a collection rule for one of the the Active Directory® directory service reports.
There are two or more well known objects that have the same SID attribute in the SAM database. The Distinguished Name of the duplicate account is %1. The newest account will be kept, all older duplicate accounts have been deleted. Check the event log for additional duplicates.
For more information, see:
Microsoft Help and Support for Microsoft Windows Server 2003
Microsoft Knowledge Base