What are the methods to remove duplicates from an MS Outlook PST file?

To remove duplicates from an MS Outlook PST file, you can use the following methods:

  1. Manual Deletion – Sort emails by subject, sender, or date, and delete duplicate emails manually.
  2. Using Outlook’s Built-in Cleanup Tool – Navigate to File > Options > Mail and use the "Clean Up" feature to remove redundant messages.
  3. Creating Rules to Prevent Duplicates – Set up Outlook rules to filter incoming emails and avoid duplication.
  4. Using a Third-Party Tool – A specialized tool like Duplicate Email Remover can quickly scan and remove duplicate emails from your PST file, saving time and effort.
  5. Export & Re-import Emails – Export your mailbox to a PST file, enable the "Do not import duplicates" option during re-import, and remove repeated items.
Using tools like Duplicate Email Remover is one of the most efficient ways to automate the process and ensure a clutter-free Outlook mailbox.
 

nivalgarza

Member
Jul 22, 2025
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There are many methods to remove duplicates from an MS Outlook PST file. You can use the best method like Softaken PST Duplicate Remover which quickly scans PST files like emails, contacts, notes, tasks, events, calendar, etc, finds duplicate items and removes them without losing any original data. The software manages a large number of duplicate PST files without downloading any application. The tool has a simple UI for non-technical and they can use it without any technical skills. It will support all Windows OS versions like 11, 10, 8.1, 8, and 7. Users can use a free demo version before buying this tool.