How to Merge Microsoft Outlook PST Files: 5 Easy Methods
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The Microsoft Outlook PST file contains all the data for your inbox. If you have more than one email account within Outlook, you will also have multiple PST files. You may well find yourself having to merge those multiple PST files to create a unified account. But how do you merge multiple Outlook PST files?

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Why Do You Need to Combine Outlook PST Files?

Good question. Why would you need to combine multiple Outlook PST files? There are several instances where combining existing PST files into a new data file is the best course of action:

  • Merging multiple old accounts
  • Combining work and social accounts
  • Creating backups of existing accounts
  • Receiving files from a team or family member
  • Migrating to a different service or exchange

That is just a handful of reasons as to why you merge PST files. I’m sure you can think of more use cases.

1. Combine Outlook PST Files Within Outlook

You can combine multiple Outlook PST (an acronym for Personal Storage Table) files within Outlook. Combining PST files within Outlook is a quick task that works with all versions of Outlook from 2007 up to the current time. It is a two-stage process.

First, you create a brand-new blank PST file. Then import your existing PST files. Here’s how it works.

  1. Select your Home tab, then New Items > More Items > Outlook Data Files. Give your blank data file a name and save it.
  2. Now, head to File > Open & Export > Import > Import from another program or file. On the next screen, select Outlook Data File (.pst).
  3. Browse to the PST file you want to import. You now have the option to replace duplicate files, allow the creation of duplicates, or to refuse the import of duplicate files. Your choice here depends on the PST files you are importing. In this example, choose Do not import duplicates. (Please remember that you need the password for each PST file you are importing.)
    outlook import data file pst merge
  4. Once the import completes, you can start the process again to import as many PST files as you want into a single new PST file.

See how easy it was. Here are 10 more awesome Outlook features you’re not using 10 Hidden Features of Microsoft Outlook That Are Rarely Used 10 Hidden Features of Microsoft Outlook That Are Rarely Used Microsoft Outlook has a ton of features. Use these lesser known Outlook features and improve your email workflow Read More !

2. Merge PST Files

Merge PST Files is a free tool that you can use to merge multiple PST files simultaneously. Merge PST Files builds on the manual merge PST process in the above section, allowing you to make a comprehensive selection.

For instance, Merge PST Files lets you filter the PST merge by folder type, such as only importing contacts or calendar folders from different PST files.

Merge PST Files is free for non-commercial use. However, “it will not run in a domain environment.” That is because Merge PST Files is a product developed by ReliefJet Essentials, which is a premium Outlook management tool.

Download: Merge PST Files for Windows (Free)

3. ReliefJet Essentials for Microsoft Outlook

Merge multiple Outlook PST files.

From the free tool to the premium tool. What’s the difference? Well, ReliefJet Essentials for Microsoft Outlook packs in all the functionality of the free Merge PST Files program, but you get an extensive range of additional Outlook tools, too.

For instance, ReliefJet Essentials allows you to:

  • Import and export any Outlook item
  • Export your contacts into vCard format
  • Find, remove, or move duplicate Outlook items and attachments, with reporting on any duplicates
  • Extract email addresses and URLs from email message headers and text

And a massive list of extra tools, too. This alongside the ability to merge or join multiple PST files simultaneously.

As far as tools go, ReliefJet Essentials certainly packs in more than most. The Premium version retails for $49.95 for a single system, including every ReliefJet Essential utility. However, they also offer a Single Utility license for $14.95. The Single Utility license lets you install a single utility—in this case, PST Merge—on your system.

Download: Relief Jet Essentials for Windows (Free) | Windows ($14.95 Single Utility) | Windows ($49.95 Personal License)

4. Datavare Outlook PST Merge

How to Merge Microsoft Outlook PST Files: 5 Easy Methods outlook pst merge datavere pst merge

Datavare is a freemium Outlook PST merge tool. The free version comes with one significant limitation; you can only merge two PST files simultaneously. In that, the free version is similar to merging your PST manually or using the free Merge PST Files tool above.

The premium license comes with a few PST merge perks, most notably merging more than two PST files simultaneously. You can use several large PST files and merge them quickly. You can also choose various files from each PST file to merge into a new PST file, another handy feature.

Download: Outlook PST Merge for Windows (Free) | Windows ($29 Personal License)

5. Stellar Merge Mailbox for Outlook

stellar merge mail outlook pst merge

Stellar Merge Mailbox for Outlook is another freemium tool. Again, the free version of Stellar Merge Mailbox restricts you to merging two PST files simultaneously.

Stellar stands out among the freemium tools for a couple of reasons. One, the UI is very easy to use and appears more “modern” that some of the alternatives. Second, the premium version allows you to Join your PSTs, rather than just merge them.

Instead of adding entire PST files into a single large new PST, you can add PSTs as a separate folder structure. Handy if you have detailed existing file structures you don’t want to lose when creating your new PST.

Also, Stellar Merge Mailbox will merge password protected PST files without requiring a password. You will still need the password to access the files within the new PST, but you can make the merge.

Download: Stellar Merge Mailbox for Windows (Free) | Windows ($39 Personal License)

Merging Outlook PSTs, the Easy Way

You have five methods for combining your Outlook PST files. The manual option is basic but does the job. It can become time-consuming if you have numerous PST files that need merging.

If you have a vast backlog of PST files to merge, consider one of the premium options. Stellar Merge comes with a decent UI and some handy settings, while ReliefJet Essentials packs everything and more into a single package (albeit, at a slightly higher price).

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Explore more about: Desktop Email Client, Microsoft Office 2016, Microsoft Office 2019, Microsoft Office 365, Microsoft Office Tips, Microsoft Outlook.

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  1. Shiv Gupta
    September 24, 2019 at 5:00 am

    One can also try Kernel Merge PST software to merge multiple Outlook PST file in single PST file.

    • Harry Brown
      October 21, 2019 at 5:58 am

      The Kdetools PST Merger is the best and advanced features tool. This Software easily merger multiple PST files into single PST files. This tool supports both in ANSI and UNICODE formats. This Software merges various PST files such as mails, Contacts, Calendars, Notes, Tasks, and all. This merger has a free preview option that helps we can easily check before the conversation. This tool has not require MS-Outlook installation. It supports all the Window Version and Outlook Version.
      More Details: https://www.kdetools.com/pst-merge.html