A duplicate archive message is created for all messages moved or saved in the Domino Retention Plan folders every time the Lotus Domino Archiving Task runs. If the Archiving Task runs on a schedule which allows enough time for multiple passes on the mail file, the same items are potentially archived thousands of times.
The issue occurs only when the Mailbox policy Archiving Actions Delete original items after archiving and Create shortcut to archived item after archiving are unchecked and the Retention Plan Folder ARCHIVENOW attribute is set to True in the RetentionPlan.xml.
Select the option "Delete original items after archiving" and "Create shortcut to archived item after archiving" in the Mailbox policy Archiving Actions. Synchronize the mailboxes to apply the change. Replace the design of the Domino mail files with the Enterprise Vault Mail template to enable the users to access the Retention Folders archived items.
This issue has been addressed as part of the following release:
Enterprise Vault 9.0.3 - Release Details
Enterprise Vault 10.0.1 - Release Details