Product: MessageSave for Microsoft Outlook
MessageSave makes removing duplicate Outlook email messages a very simple process. Simply follow the steps below.
Change to the Outlook folder you would like to eliminate duplicates from.
Click on the MessageSave button. Enable all options under File Naming, including "Overwrite Existing Files"
and save all messages in that Outlook folder. Use the default "msg" format.
After MessageSave finishes the export, drag and drop the saved "msg" files back into an empty Outlook folder.
All duplicate messages will have been removed.
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