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If you're not staying on top of your Exchange 5.5 organization's directory replication, you can end up with orphaned objects. Orphaned objects remain in a remote site even after you've deleted the object from the original site.
Orphaned objects typically occur when directory replication breaks down, someone deletes objects from a site, and the deleted objects don't get the chance to replicate. Once the tombstone period expires on the deleted objects, replication no longer occurs even after directory replication starts working again.
The best way to prevent this problem is to check for proper directory replication on a regular basis. But if you do encounter an orphaned object, it's possible to remove it from the directory. Follow these steps:
The deletion will now replicate to the remote site and remove the formerly orphaned object.