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Know How to Merge PST Files without Duplicates? Best Ways

  Mark Regan
Mark Regan
Published: April 22nd, 2025 • 5 Min Read

Do you want to merge PST files without duplicates and looking for a structured guide? If yes, then this technical guide will help you to overcome your conundrum with quick and easy steps. Over the period, users have several PST files stored on their systems. However, when you are thinking about transitioning from your system, it is necessary to combine the PST files without having any duplicates.

Duplicate items in PST files can lead to performance issues, slowing down Outlook’s ability to receive and send emails. Secondly, you may also face challenges in searching and managing your Outlook data files. Therefore, it is necessary to combine PST files without duplicates.

Table of Contents
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  1. Best DIY Way to Combine PST Files without Duplicate Items
  2. Expert Solution to Merge Outlook Data Files without Duplicates
  3. Concluding Words

Best DIY Way to Combine PST Files without Duplicate Items

If you want a simple do-it-yourself approach, you can go with the built-in import/export wizard functionality in Outlook. In this technique of merging Outlook data files without duplicates. We will initially create a blank PST file in Outlook. Thereafter, we will use the import/export wizard utility to import Outlook data files for merging and enable the import without duplicates functionality. To have a detailed, structured guide of the technique, please go through the section below that describes the working steps.

How to Merge PST Files without Duplicates via the Outlook Application?

Phase 1: Create a Blank PST File in Outlook

  1. Launch the Outlook application on your PC.
  2. Next, go to the File tab and click on Account Settings>> Account Settings
  3. Now, go to the Data Files tab and click on the Add option.
  4. Thereafter, choose the storage path and name the blank PST file

Phase 2: Import PST Files without Duplicates

  1. Next, go to the File tab and click on the Open & Export
  2. Then, choose the Import/Export button from the list.
  3. Now, select to import from another program or file and click Next.
  4. After that, choose the Outlook data file (.pst) and click the Next
  5. Thereafter, enable the radio button of Do not import duplicates and click on Browse.
  6. Next, choose the import location as the blank PST file created above and click on the Finish
  7. Finally, repeat the same set of steps for all the PST files to merge PST files without duplicates via the Outlook

Limitations of the DIY Approach

  • The above-described do-it-yourself technique is a very time-consuming approach. If you are handling many Outlook data files for merging without duplicates, then you may find difficulties. Since the import export wizard of Outlook only allows you to import one PST file at a time. However, this approach does not provide filter or email-level filtered merging .
  • Another drawback of the manual way of the Outlook import/export wizard is that there is always of possibility of human errors. If you are handling several Outlook data files, then there is a higher chance that you may forget some PST files for importing.
  • One common pitfall faced by users while merging many PST files without duplicates using this DIY approach is that you may face the file size limitations. Therefore, to remain with Outlook data files, you need to restart the above guided steps from the start.

Expert Solution to Merge Outlook Data Files without Duplicates

If you want a more advanced solution with email and folder-level filter settings for merging PST files without duplicates. You may use the BitRecover smart PST merge tool. This is a dedicated offline desktop-based utility built for combining Outlook data files without duplicates. Additionally, this utility allows you to apply filter settings before starting the combining process. Now, let us discover how to run this expert solution to overcome your problem.

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How to Combine PST Files without Duplicates? Working Guide

  1. First, download and run the suggested solution on your desktop.
    combine PST files without duplicates
  2. Next, choose the mode to load PST files into the utility interface.
    choose Outlook data files insert mode
  3. Now, check out the folders that are required for merging.
    enable folders for merging
  4. Thereafter, choose the combining mode as per your need and enable the merge PST files without duplicates.
    merge PST files without duplicates
  5. Then, go to the filter options tab within the application and apply advance filter settings as per your need.
    advance filter settings
  6. Lastly, click on the Merge button to combine Outlook data files without duplicates.
    start merging process

Concluding Words

To sum up the above blog post on the topic of how to merge PST files without duplicates. We have started by the Outlook application functionality for merging Outlook data files without duplicates. However, this technique is very time-consuming and does not provide full control over your task. Therefore, we have discussed the smart solution inserted with email and folder-level features. Lastly, we have seen the working steps of the expert utility to combine PST files without duplicates.