How to Merge PST Files Without Duplicates – 2 DIY Methods

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Methods to Merge PST Files without Duplicates

There are different ways to merge multiple PST files into one. The manual method is suitable for those with sufficient technical knowledge to perform the necessary steps. On the other hand, if you are a complete novice, a professional tool is the best solution for you. Below we are discussing the manual method to combine PST files without duplicates.

Step 1: Create a New PST File

  • Open MS Outlook in your system.
  • Click on the New Items in the top menu bar.
  • Now, select the More Items option from the list.
  • After that, choose the Outlook Data File option from the list.
  • Now, give a suitable name to the Outlook Data file and press OK.
  • This file will appear as an Outlook mailbox account in the left section.

Step 2: Import PST Files You Want to Merge

  • In the MS Outlook application, click on the File.
  • After that, select the Open & Export option and choose the Import/Export option.
  • In the Import Export Wizard, select the Import from another program or file option and hit Next.
  • Click on the Outlook Data File (.pst) option and press the Next button.
  • In the next step, locate the file you want to merge and tick the Do not import duplicate option. Press Next.
  • Select the destination mailbox folder and hit the Finish button to complete the file import.

If you have added desired PST files into the MS Outlook application and want to merge Outlook files, follow the below steps.

  • Select the source mailbox account and select all the desired emails.
  • Drag all the emails and move the cursor to the newly created PST file.
  • At last, release the hold at the destination Outlook mailbox account. It will move all the emails.
  • Repeat this process for all emails of PST files that you want to merge.
  • It will merge all your emails from two different PST files into a new one.

Performing the above procedure, you can easily merge several PST files into one without duplicate mailbox items. Despite being effective, this approach is not feasible for all users. It could be difficult to perform for the novice or non-technical users.

Limitation of Manual Method

As we mentioned above, the manual approach to merge multiple PST files into one in Outlook 2016 is not suitable for many users. It has various limitations that make this approach inappropriate for non-technical users. We explain some major limitations of the manual approach.

  • It is quite complicated and time-consuming. You must have the required technical expertise in the respective field.
  • The chances of file corruption are high. If you fail to perform the steps correctly, you may end up losing your mailbox items.
  • This technique is viable when you have two or only a few PST files. However, if you have multiple PST files, this approach may not be feasible for you.
  • During the manual approach, you have to take care of every parameter that affects the file merging. Not providing suitable details may give undesired results.

Because of these reasons, the standard method has become obsolete. The best and most preferred solution to combine multiple PST files is the automated tool.

Professional Tool to Combine PST Files without Duplicate

DRS PST Merge Tool is undeniably the best and most powerful software to merge PST files without duplicates. It offers various innovative and useful functionalities that make the output more precise and accurate. Along with that, you can merge any number of Outlook PST files created by any version of MS Outlook. Also, it is widely compatible with Windows 11 and other prior versions.


I hope this article has provided you with all the necessary information regarding how to merge Outlook PST files mailbox items. We explained two different methods. The manual solution is ideal for technical users. While if you are a novice user, we suggest you opt for the professional PST Merge Tool. It has all the advanced functionalities for better results.

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