Summary:- PST files are very well-known by all Microsoft Professionals; as it stores all the Outlook mailbox data in a specific PST file. Suppose you are looking for a solution to merge multiple PST files into one. So, I am here with a blog that will suggest the best manual method to merge multiple PST files. You can also go for the SysInfo PST Merge Software that allows users to combine multiple Outlook PST files into one.
What is a PST file?
Email client Microsoft Outlook is used widely across the globe, and different users configure and use it to access other email services. The email data in MS Outlook is stored in a single PST file. In a word, the PST file is the database of MS Outlook.
Why Do we need to Combine Multiple PST Files into One?
This requirement is not often raised by normal or home users, but when MS Outlook is used in large organizations where email is the basic source of any communication, the requirement pops up rapidly. This is because:
- The size of PST file is limited (i.e. 2 GB for ANSI and 20 GB for Unicode)
- Single user accesses multiple emails on different computers
- Employee resigns and you have to handle its previous emails.
These are the basic why we need to combine multiple PST files into one single PST. As of-course, it gives an ease to access all the emails in a single interface.
How to Merge Multiple PST Files into One?
Many tricks and methods are mentioned over the internet to combine PST files, but I always suggest my readers reach their goal using a manual technique. Also, if you have a few PST files, manual merging is the best option rather than opting for an automated tool. It is often seen that users have protected their PST files with passwords. If you forget the password, you can unlock the password-protected PST file by following simple steps. People often try unusual tricks to manage PST files, and their PST file gets corrupted; in that scenario, you can read the complete steps to repair Outlook PST file.
Steps to Merge one or more PST Files into One Manually
If you want to merge the large PST file that can be used with the latest Outlook versions, you can use the below mentioned manual steps:
Step 1: Create a new blank PST
Follow the simple steps to create a new blank Outlook PST:
- Start Outlook and click on New Items>> More Items>> Outlook Dat File.

- You have to select a location to save the new blank PST and provide a name for it.
- Click on the Ok button to proceed further.

Step 2: Merge. PST files into the newly created blank. PST file
Follow these steps to merge PST files into the new File created above:
- Open Outlook and click on the File.
- Opt for the Open and go for the Import option.
- In the Import and Export Wizard, select the Import from another program or File and click on the Next.
- Select Outlook Data File (.pst) and tap Next.

- Now, click on Browse to locate the file to be imported.

- Mark the Do not import duplicates box.
- Click on the Next button.
- Add the folder you want to import and click on the Next.

- Finally, mark the Include subfolders and Import items into the same folder in the boxes and click on the Finish button.
An Expert Solution to Merge Multiple PST Files into One
If you want to merge two or more PST Files into One, I suggest you go for a third-party tool. Many third-party PST merge tool are available in the market and may perform a Google search for that. I would personally recommend an inexpensive tool I used for my organization. You can try the best free pst merge tool. I suggest you try a demo version of this tool before you purchase it.
Conclusion
The blog will offer users both manual and expert methods. Now it is your call to pick any of them to merge multiple PST files into one. But keep a backup of your data if you want to try a manual process, there are chances of data loss. I hope your doubts are clear on merging or combining multiple PST files manually and using an automated tool.


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I was looking to merge multiple PST files at my work place. Tried using the manual process you mentioned in this post, it worked but quite slow, I would prefer going with the automated technique you mentioned. I tried the demo of the tool you recommended here, it worked perfectly, but because it is a paid one I have submitted a request to my boss for the purchase.
Just for correction, you have written “Steps to combine PST files using third party tool” but no step is specified, consider making the appropriate correction. Thank you for sharing such a wonderful article. It really helped me. Hope to get some more on managing PST files here.
Well thanks Mark for taking time to drop your experience, i am glad that the process i specified in the article helped you with your work. As you say that the manual process is slow, well that’s the reason why there are automated tools in the market so that. Thank you for pointing the error in the article, i’ll surely change it right away. I am happy that you came up with a suggestion and it really makes a difference. I hope you merge your PST files perfectly. Hope you land back on this blog again.
Thank you so much for your quick reply “phillcollins”. Currently I got my work done using Manual Technique. Thanks again
You are a wonderful writer; the steps provided here are easily understandable and resolve the issue easily. Well I have 3 Outlook Accounts configured on different computers and two of them are just used to check old emails. I am stunned that I never ever thought of merging my emails into a single computer. I think it’s time to merge them all and start managing my emails easily on a single computer, I just need to ask you, should I do this manually or automated tool you specified is the best option? Money is not an issue with me; I just need a perfect option for my work. Thanks for sharing this article on my profile.
I hope you’ll reply soon so that I can combine my Outlook PST files soon…
Michael, I am glad that you liked the article. Well yes it’s the perfect time to combine your multiple Outlook PST files into a single PST. Though you can get it done manually as mentioned in the post, but if you can bear paying for the tool to merge PST files, I would nod and abide with your decision of buying the automated tool. With it you can save your time and no need to worry about duplicates. The tool will give you many other options before processing. But remember, you must check the tool capability using the demo version. I hope this will help. Enjoy! and hope to see you back here.
Happy Me! thanks a ton, the tool worked like a miracle for me. Though manual technique works as well but i saved a lot of time. Keep posting such articles.
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