2 DIY Approach to Merge PST Files Without Duplicates

Written By
Shivansh Shukla

Updated on
July 17th, 2025

1 minute Read
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Summary: Users want to merge PST files without duplicates to manage all the emails systematically. It also includes backup PST files data for saving them on a long-term basis. However, it can be complicated for users to do it without any issues. Don’t worry! We will cover all the required information to make the process simple and easier. It includes the manual and a risk-free PST Compress Tool. First, examine the user’s problem. 

User query: “Having a lot of PST files is truly challenging, as it makes it difficult to manage them. To avoid it, I was thinking of merging them into a single file to keep the PST file data without occupying unnecessary space. Although I found a solution, they are risky to use. So, if you have any reliable method, please provide it to us.”

Top Two Reliable Techniques to Merge PST Files Without Duplicates

Here, you will learn about the methods that help you complete this process effortlessly. Besides, a manual method is full of risk and time-consuming. As a result, using an automated approach is useful for users to get quick and secure outcomes. 

Way 1. Manual Solution to Combine PST Files Without Duplicates

Now, we will cover the complete steps to do this process for free. It consists of two steps to finish it successfully. 

Phase 1. Make a New Blank PST File

  1. To begin, run desktop-based Outlook 
  2. After that, move and tap Home
  3. Then, click New items and choose More Items
  4. Further, pick: Outlook Data File.
  5. Next, provide the location to store a blank PST file with the desired name. 
  6. Thereafter, hit Ok

Phase 2. Move Data From Old PST to New File

  1. In Outlook, click the File tab -> Open & Export.  
  2. Later, choose from the list: Import/Export.
  3. Now, pick the option from the list: Import from Another Program or File. 
  4. Thereafter, a new list will be visible; select Outlook Data File(.pst). Hit Next.
  5. Then, locate the location where you stored the PST files. 
  6. Subsequently, mark Do Not Import Duplicate Items feature. 
  7. Besides, mark Include Subfolder to import items with the same folder.
  8. At last, click Finish to start the process.

With the above procedure, you might understand that it is time-consuming and complicated. If you want to do it without any issue or data loss, try this automated solution. 

Way 2. Professional Approach to Merge PST Files and Remove Duplicates

MacSonik PST Compress Tool is an outstanding utility that makes the process simple and easy. With its user-interactive interface, it will be easier for users with or without technical knowledge to merge PST files without duplicates. Apart from this, it allows users to merge more than two PST files at once. In addition, it gives various reliable features like duplicate remover, save attachments without attachments, split large PST files, and many more. Moreover, the data integrity will be maintained, and the output will be received efficiently and smoothly. 

Step-By-Step Guide to Combine PST Files Without Duplicates

These steps will be helpful to begin this process automatically and complete it without issue. 

  1. To start, download and open the PST Compress Software on your system. 
  2. Now, browse and add the PST file to merge and tap Open
  3. Further, view the PST file detail and tick to move further. Hit Next
  4. Later, enable the duplicate remover feature to exclude duplicates. You can also use other features if required. 
  5. Next, assign the desired name and path to store output PST files. 
  6. Then, hit the Compress tab to start the process. 

Conclusion 

This post is filled with all the information related to combining PST files into one. You can use the manual or an automated technique to merge PST files without duplicates. However, many users complain about data loss and other issues by using the free method. If you want to avoid such risk and need a reliable solution, a professional utility is amazing. With this software, the process will be completed within a few seconds and instantly. 

Q1. How to merge multiple PST files into one?

Follow the steps to combine your PST files into a single PST file. 

1. Make a new PST file inside Outlook. 
Visit the Home tab in Outlook and click New and expand it. 
Pick More Items – Outlook Data File
Assign a name and location and click OK
2. Move old PST File Data into the Newly Created PST File 
Move to FileOpen & ExportImport/Export. 
Tap Import from Another Program or FileOutlook Data File(.pst).
Browse the PST file and tick Do Not Import Duplicate Items
Then, mark the Subfolder to import items to the same folder. Click Finish

Q2. How to merge Outlook folders without duplicates?

If you want to merge PST files without duplicates, use the MacSonik PST Compress Tool. This software enables users to compress multiple PST files instantly with zero risk. 

About The Author:

Shivansh Shukla is a technical content writer who researches and provides reliable solutions to help users resolve their problems. He offers effective procedures for email migration, data backup, and file conversion for all technical and non-technical users.

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