OID "%1" defined for object %2 conflicts with the schema extensions needed for Windows Server 2008 R2. Status/Consequence ...

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OID "%1" defined for object %2 conflicts with the schema extensions needed for Windows Server 2008 R2.
[Status/Consequence]
Adprep will not extend your existing schema.
[User Action]
Contact the vendor of the application that extended the schema with the OID value "%1" and resolve this inconsistency.  Then run adprep again.