Duplicate email messages occur in Microsoft Outlook due to a variety of reasons. Anti-Dupe for Microsoft Outlook removes duplicate email messages by pulling each email message, one by one, and checking all other email messages for the same pre-determined criteria. If Anti-Dupe for Outlook finds a duplicate email message, it moves the duplicate to your Outlook Deleted Items folder. Then the process repeats for each following email message in your Outlook email folder. Although the average user has hundreds – even thousands – of email messages, it only takes Anti-Dupe for Microsoft Outlook a few seconds to scan and delete all duplicate email messages.

Remove duplicate Outlook emails
The criteria Anti-Dupe for Microsoft Outlook uses to remove duplicate emails are:
  • To (recipient)
  • From (sender)
  • Subject
  • Message text content
  • Sent time
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