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How to Merge Multiple PST Files into One? – Complete Solution

Published By Jamie Kaler 
Rollins Duke
Approved By Rollins Duke
Published On February 29th, 2024
Reading Time 8 Min Read
Summary: Here we are going to explain the best methods to merge PST files together without duplicates. You will get here both the manual method and PST merge tool with complete information and a step-by-step guide to combine PST files together.

If we are searching for the best email client application, then Outlook first comes to mind. Outlook is a desktop-based email client application developed by Microsoft. It provides a platform where we can send/receive emails and easily manage other daily tasks.

Therefore, large organizations and business users have preferred Outlook as the first choice. In addition, Outlook users are worried about the large database of emails that is hard to oversee. The older Outlook version was a PST file that stored all mailbox data on the local system that was bound by size limits.

As we see in the mentioned query, an Organization received many PST files from different users. They want to know how to merge PST files into one without duplicates so that they maintain working data daily.

However, many users, not only professionals but also general users want to combine PST files without duplicates. RecoveryTools team experts understand the needs of all types of users. And, we have brought one of the best solutions to carry out the desired results.

Hello, I’m Frank Branca from London. I work in a large organization as a data manager. Every day my organization sends and receives thousands of emails. Therefore, we have a large amount of email data in our database. For basic email communication, we use Microsoft Outlook email clients. Daily I have received many PST files from different users. Therefore, I am looking for a solution to merge PST files into One. Does anyone know how to combine PST files without duplicates? Please help me!!!

Reasons to Combine PST Files without Duplicates

  • There is a big reason to merge PST files i.e., to manage work data in a single place or format.
  • Users want to consolidate their old files into a single PST format. To do this, they need to join multiple PST files into one.
  • The user wants to migrate multiple Outlook profile data into one place or one account.
  • Many users want to prevent data loss and corruption issues.
  • To access multiple Outlook account databases in one place to increase work productivity.

Best Solution to Merge PST Files Together without Duplicates

A faster, simpler, and more efficient solution to merge PST files with the RecoveryTools PST Merge tool. The software provides a simple and easy-to-use interface for all novice and professional users. One can easily combine all items such as emails, contacts, calendars, notes, tasks, journals, etc.

It is a completely standalone software that doesn’t require connectivity with Microsoft Outlook. To consolidate PST Files into one, you need to download the software first. Also, this tool comes with the free demo version, so that users can easily analyze the performance and features to join PST files together.

Quick Steps to Join PST Files Together

  • Step 1: Download the PST Merge tool.
  • Step 2: Upload your PST data files/folders.
  • Step 3: Check the needed data from the panel.
  • Step 4: Enable the Merge option as needed.
  • Step 5: Apply the filters and select the path.
  • Step 6: Hit on the Merge to merge PST files.

Complete Steps to Merge Outlook PST Files into One without Duplicates

  1. Download and run the PST Merge tool and click on the Next icon after reading all the instructions.

    PST Merge tool

  2. Upload the Outlook PST file data manually (Select Files or Select Folders) or automatically directly and click on the Next icon.

    Upload the Outlook PST file

  3. After that, check the needed folders or subfolders from the software’s panel and hit the Next icon.

    needed folders or subfolders

  4. Select the Merge Option as per your choice between Merge Multiple PST Files into a Single PST File and Join Multiple PST Files into a Single PST with Separate Folder options.

    Merge Option

  5. Check the Remove Duplicates option to join PST files without duplicates.
  6. Click on the Filter Options tab and apply the advanced filter to merge PST files together selectively.

    merge PST files together selectively

  7. It will choose a desktop location by default and you can select the other location using the Browse (Folder) option.

    desktop location

  8. Lastly, hit on the Merge option to join PST files without duplicates.
  9. After the successful process, a pop-up will appear, and click on the OK button.

    pop-up will appear

Best and Advanced Features of PST Merge Tool

  • Load Single/Multiple PST: This PST Joiner tool provides dual options to upload single or multiple PST files/folders manually using the Select Files and Select Folders options to consolidate PST files into one.
  • Load Profile Data Automatically: if your Outlook profile is connected to the same machine, then this Combine PST tool will load the data automatically from the default storage location.
  • Merge Selective Data: This software allows users to select the needed folders or subfolders. Also, they can combine all email data from Inbox, Sent, Draft, Spam, Bin, and other created labels.
  • Merge Options: This tool gives two ons to Merge Multiple PST Files in a Single PST File and Join Multiple PST Files into a Single PST with a Separate Folder.
  • <strong>Join PST Files without Duplicates: </strong>Yes, our PST merge tool provides separate Remove Duplicates options to remove your all duplicates from the uploaded data.
  • Advanced Filter Options: This advanced filter allows users to merge and join selective emails via Date Range, To, From, Subject, Email Components, etc.

To learn more advanced features of the PST merge tool to merge PST files together, then visit the given product page, where you will get the complete information about this tool.

How to Combine PST Files without Duplicates Manually?

This is the only manual method, which is divided into two steps. Both steps are given below step by step in detail:

Step 1: Create a New PST File

  1. Open your Outlook account.
  2. Click on the New Items >> More Items >> Outlook Data File option.
  3. Choose the location to save the resultant PST.
  4. Put the name of the file and the OK button.

Step 2: Import Old PST to New File

Here, you need to import your old PST to the newly created file to solve the query can you merge PST file into one?

  1. Open Outlook >> File Menu.
  2. Open & Export >> click on Import / Export.
  3. Choose “Import from another program or file”.
  4. Select Outlook Data File (.PST) and Next.
  5. Browse the file that you want to import and choose the respective options.
  6. Select the folders check the respective options and Finish.

Hence, using this process, you can easily merge PST files into One using Outlook but the main limitation is that you need to combine PST files without duplicates. Therefore, this process will take a lot of time and effort.

Drawbacks of Manual Methods

  • Outlook must be connected to the machine and properly subscribed account.
  • High risk of data loss, while moving PST files.
  • Multiple steps this method lengthy and time taking.

Frequently Asked Questions

  • What is the PST merge tool?

    PST merge tool helps users to combine multiple PST files into one file together with numerous advanced features and filters.

  • How do I connect PST files?

    Yes, you can connect PST files by importing them. follow the step 2, which are given above.

  • What is the merge type?

    There are five main kinds of mergers: conglomerate, congeneric, market extension, horizontal, and vertical.

  • What is the PST file in Outlook?

    Outlook uses PST format to store complete mailbox data including emails, contacts, calendars, notes, journals, tasks, etc. This format can be only opened in Outlook email clients.

  • Can I delete Outlook PST file?

    You can take an Outlook data file off the Folder pane by closing it. But remember, closing it doesn’t delete the file from your computer. To do this, right-click on the name of the Outlook Data File in the Folder pane, and then select Close “Outlook Data File”.


In the above article, we have explained the complete process to merge PST files into one. Here we have provided two solutions: the manual method and the PST merge tool to combine PST files without duplicates. This solution is perfect for you and will provide a better and more effective solution to join multiple PST files together or even unlimited numbers of files. You can also use the manual way but that will take a lot of time and effort and will not result in proper data with 100% accuracy.