Quick Ways to Merge PST Files Without Duplicates

merge pst files without duplicates

Summary: One common problem faced by Outlook users is merging PST files without ending up with duplicate emails. Duplicate emails not only clutter your inbox but also waste your valuable time and effort in sorting through them. In this blog post, we will explore different methods to merge pst files without duplicates. We will also discuss some best practices for managing your PST files to avoid future complications by performing the manual methods and using the Professional Sysinfo PST Merge Tool. So, let’s dive in and learn how to merge PST files without duplicates.

Ways to Combine PST Files without Duplicates

There are several techniques available to merge several PST files into a single file. The manual approach is appropriate for individuals with the technical expertise to execute the required procedures. However, if you lack the necessary proficiency, it is advisable to utilize a professional tool. The following section outlines the manual procedure for merging PST files while avoiding the duplication of data.

Method 1: Utilizing Microsoft Outlook

In this approach, we will consolidate PST files in two stages. Firstly, we will generate an empty PST file, and subsequently, we will import the data from the old PST file to the new one.

Step 1: Generate a New Blank PST File

  • Launch Microsoft Outlook.
  • Select the File tab → New items → More items → Outlook Data File.
  • Browse to your preferred file destination and specify a name for the PST file.
  • Click the OK button.

Step 2: Import Data from the Old PST File to the New One

  • Access the File menu, followed by the Open button.
  • Choose the Import option.
  • The Import and Export wizard will appear. Opt for the Import from another program or file.
  • Select the Outlook Data File(.pst) option and click the Next button.
  • Click the Browse button, choose the PST files, and then choose the option “Do not import duplicates.”
  • Tick the Include subfolder option and import items to the same folder. Click the Finish button.

LoopHoles of Manual Method

There are several drawbacks to using manual methods for merging PST files without duplicates:

  1. Time-consuming: The manual method can be very time-consuming, especially if you have a large number of PST files to merge.
  2. Prone to errors: Manual methods are more prone to errors than automated methods. If you accidentally copy the same email twice or miss out on some emails, you may end up with duplicates or missing emails.
  3. Lack of automation: Manual methods require you to perform each step manually, which can be a tedious and repetitive process. Automated methods can save you time and effort by performing these steps automatically.
  4. Risk of data loss: If you are not careful, you could accidentally delete important emails or data while merging PST files manually.

Method 2: Use of Profesional Tool to Merge Multiple PST Files

A popular method of merging PST files without any duplicates is by using the PST Merger. This professional software is specifically designed to combine multiple PST files into a single file, including all types of items such as emails, contacts, calendars, and tasks. The following steps will guide you through the process:

  1. Download and install the PST Merge software for Outlook.
  2. Click on the “Add PST Files” button to select and open multiple PST files.
  3. Select the merge options and choose a path location to save the newly merged PST file.
  4. If necessary, you can apply a password to encrypt the PST file after the merge.
  5. Check the “Remove Duplicate & Exclude Deleted Items” option, and then click on the “Next” button.
  6. Wait for the merging process of the selected PST files to be completed successfully.

By following these simple steps, you can merge PST files without any duplicates using the PST Merge software.


In conclusion, merging multiple PST files without any duplicates is a common task for many users. It helps to keep all emails, contacts, calendars, tasks, and other items in one place, making it easier to manage and organize them. To achieve this, you can use various professional software tools like Sysinfo PST Merge Tool which is specialized to merge multiple PST files without duplicates. By following the step-by-step instructions provided by these tools, users can easily merge their PST files, saving time and effort in the process.

Read More: 2 Best Ways to Convert PST to MBOX Format

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