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How to Free Merge PST Files Without Duplicates Step By Step?

How to Free Merge PST Files Without Duplicates Step By Step?


Many Outlook users are looking for a solution to merge multiple Outlook PST files into a single file with all items. If you are one of them, you will definitely get a complete solution at the end of this blog. Here, we are going to provide a full process to free merge PST files without duplicates. So, let’s start.

First of all, let’s take a quick overview of Outlook PST file and then look out the need of merging PST files.



Quick Introduction of Outlook PST File


Microsoft Outlook is a well-known email client application. It stores all the data in PST file format that includes emails, contacts, notes, tasks, calendars data and many more. The size of the PST file is limited depending on the different versions of Outlook. For example- In Outlook 97 to 2000, the file size limit is 2 GB. Outlook 2003 and 2007, the limit is 20 GB. In the latest Outlook 2010, 2013, 2016, and 2019, the limit is 50 GB.

Why Need to Combine PST Files Without Duplicates? 


There are many possible reasons when users need to free merge Outlook PST files without duplicates into a single file. As mentioned earlier, size limitations are very low in previous versions of Outlook. But the size limitations is upto 50 GB in the latest versions. That’s why users upgrading from old version to new to get more storage space. 


Pro Tip: Learn how to remove duplicate emails from Outlook quickly.

Outlook provides an archive feature that helps users move old items to a separate archive PST file which is easily accessible in Outlook at any time. Some possible reasons behind to merge multiple PST files into one is mentioned in the following section:

  1. Users want to avoid data loss or accidental deletion issue
  2. Want to manage PST file from different Outlook accounts in one place
  3. To save time by avoiding sharing files one by one
  4. The user doesn’t want to open each file repeatedly, so he wants to combine Outlook PST files
After discussing the benefits of merging Outlook PST files into single one, it is clear that a single file is easy to handle and open.

Steps to Free Merge PST Files Without Duplicates


The manual method to merge Outlook PST files 2016, 2013, 2010, 2007 have two-step. First, create a new PST and second, import all the PST data to the newly created PST file.

Step 1. Create New PST in Outlook

Here, we will create a new blank PST file that is a first step to combine multiple PST files into one. Follow the mentioned steps.

  • Launch Outlook and click on New Items
  • Here, select More Items >> Outlook Data File
  • Specify the location where you want to save your new PST file and give it a name
  • Click OK to end the procedure.

Step 2. Import All Outlook Data Files Into New Blank PST File

Now, we need to import all the PST files into a newly created PST file. Follow the steps to perform this task.

  • In Outlook, click on the File tab
  • Select Open >> Import option
  • In the Import/Export Wizard, choose Import from another program or file option
  • From the select file type to import from section, select Outlook Data File (.pst) and click Next
  • Browse and select the file to import
  • Select “Do not import duplicates” option and click Next
  • Now, select which folder you wish to import
  • Check the Include subfolders and Import items into the same folders box
  • In the end, click on the Finish button.
This is the whole process to free merge PST files without duplicates step by step.

Limitations of Manual Method to Combine Outlook PST Files

The process of merging PST files into one using the manual method is best when you want to merge 2 PST files into 1 or you have 4 to 5 PST files to combine. But, in case you have multiple PST files, you feel very dizzy when repeating the same steps to import PST files to a newly created PST file. This process is very lengthy and confusing for non-technical users. So, it is better to go with the alternate solution i.e. third-party tool.

Recommended Solution to Free Merge PST Files Without Duplicates

In order to get an instant and smart solution to combine PST files, you can use SysTools PST Merge Software. This tool provides a complete and accurate solution to merge PST files together. It only takes a few minutes to complete the task without altering the information of the data. The software offers 2 different options: Join and Merge PST files to combine Outlook data files. With this application, you can easily merge PST archives files and password protected PST files with all emails, contacts, and other data elements. It also provides an advanced option to split oversized PST files into small parts.




The tool works on all Windows OS editions such as Windows 10, 8.1, 8, 7, and others to combine Outlook PST files into one. It also supports all Microsoft Outlook versions like Outlook 2019, 2016, 2013, 2010, 2007 and more. The application provides a separate option to merge multiple Outlook contacts folders into one and remove duplicate contacts in Outlook. The software has the ability to merge ANSI and UNICODE PST into a single UNICODE PST file effortlessly.

Concluding Words

It is difficult to manage a large number of PST files in Outlook, so it is better to merge them in a single file. Here we mentioned the complete process of how to merge 2 pst files into 1 in Outlook manually and also discussed the limitations of the manual process. To overcome this problem, it is better to use the suggested solution that helps to free merge PST files without duplicates into one with total precision. This software is completely safe and tested by the experts to merge multiple PST files into one in Outlook 2016, 2013, 2010, 2007 and other versions.

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