How to Add Multiple PST Files Into One in Outlook ?

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  • Updated on December 8th, 2023

Summary: Are you struggling to manage multiple PST data files on your system? Looking for a solution to add them in bulk in Outlook? Here’s how you can add multiple PST files into one in Outlook without compromising the content. This write-up discusses two different ways: a manual approach and a professional PST Merge Tool. Stay tuned to the blog till the end to get more detailed information about adding multiple Outlook PST files into one PST file.

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Before we move on to the procedure section, here is an overview of the topic.

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Today, almost all large organizations and enterprises use Office 365 to communicate and share data every day. This results in the accumulation of large PST files that are prone to corruption and difficult to manage. 

PST files are MS Outlook data files and cannot be accessed or opened on other platforms. It stores information like emails, contacts, calendars, tasks, reminders, and more. PST file facilitates backup in case of abnormal deletion of files, and easy to transfer e-mails to another email account or PC. Here are some reasons why users need to combine different Outlook PST files into one PST file:

  • Multiple Outlook PST hampers the performance of Outlook.
  • Managing multiple PSTs leads to the possibility of accidental deletion or loss.
  • When moving Outlook data from one email account to another.
  • Temporarily or permanently transitioning from one computer to another.
  • If transferring Outlook items between Mac and PC or vice versa.

Thus, all the reasons mentioned above create the requirement of adding into single file. Next, let us see how.

How to Add Multiple PST Files into One?

Unfortunately, Outlook does not provide a direct way to combine and open multiple PST files together. However, considering your problem, we have found an indirect way to help you open multiple PST files in Outlook. Furthermore, we have brought an alternative direct solution to merging multiple files . Furthermore, let’s see how to perform the process. 

Manual Method to Import PST Files in Outlook 

Below mentioned steps will help you add a single PST file at once. Follow as directed:

  • Open Outlook and follow: File > Open & Export > Import/Export.
  • Choose Import from another program or file and click Next in the Import and Export Wizard.
  • Select “Outlook Data File (.pst)” in the Import a File dialog box and click Next.
  • Use Browse to find the PST file to import. 
  • Choose in the Options section and click Next.
  • In the Import Outlook Data File dialog, pick folders to import, and tick the Include sub-folders checkbox.
  • Then, select the Import items into the same folder option. 
  • Finally, choose the profile and click Finish.

Your selected PST file’s mail items will now be imported into your Outlook profile. For merging outlook files , you need to repeat the same procedure.  However, there are many limitations to the manual procedure.

Limitations of Manual Process

  • These steps may not apply or may differ for Outlook versions 2010 and 2007.
  • Apart from this, if you have to manage a large number of PST files, it is not a great solution.
  • Moreover, there is a very high possibility of data loss.

So, why not switch to a master solution to overcome these limitations? Yes, the perfect way to manage multiple PST files in Outlook is an automated PST Merge tool.

Instant Way to Add Multiple PST Files into a Single PST File

If it is difficult to deal with the manual process then move on to this alternative tool. DRS PST Merge Tool is a widely used tool to merge multiple PST files into a single file. This tool helps you to manage all PST file data without deleting any valuable data. It offers various amazing features to make the merging process more effective. Moreover, the tool allows users to add PST files of any size or number. Other prime features of the tool are:

  • Allows to Merge Outlook PST files that are password protected.
  • Eliminate duplicate emails from the merged Output PST file.
  • Enable users to add encryption in the resulting PST file.
  • Work with PST files encoded in both ANSI and UNICODE formats.
  • PST Merge is compatible with all Windows OS versions.

Moving on to the next section, let us explore the workings of the tool.

Steps to Add Multiple PST Files in One file

This entire process involves two major steps:

  1. Merge Multiple PST files into One.
  2. Import the Output PST to Office 365

Step 1: Merge Multiple PST files into One files

Follow the steps given below:

  • Run the PST Merge Tool as administrator.
  • Add the desired PST files or an entire folder.
  • Select mailbox folders from the PST file preview.
  • Choose Join PST/Merge PST. Click Next.
  • Select Outlook PST items and specify the Date Range. Click Next.
  • Further, choose other additional features.
  •  Lastly, click on the Merge button.

Now, you can see the ‘combine multiple Outlook PST files’ process is done.

Step 2: Import the PST File to Outlook

The simplest way to restore PST in Outlook is by using the Office 365 Email Backup and Restore tool.

Hence, we are done this Process.


We’ve shared the top method to add multiple PST files in one simultaneously, using both manual and automated approaches. However, for a precise solution without limitations or data loss concerns, it’s recommended to choose a professional tool. With this tool, you can effortlessly combine multiple PST files into one, making it easy to open them all at once.

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