Merge PST Files into Single File – Combine PST Files Manually

pst-mergePST management is always a matter of deep concern for Outlook users. It’s a standout amongst the most widely recognized issues what Outlook users frequently confront. Whatever you have large in number, is always challenging to handle or manage. For any Outlook user, it becomes challenging if he/she has multiple PST files. As the files are in large number, you have only one solution: merge PST files into one file.

Outlook PST file is not immune to corruption. The primary reason for corruption is PST size limit. Outlook PST file has a definite size limit, i.e. ANSI PST file can store up to 2 GB of the mailbox; Unicode PST file has a size limit of 20 GB to 50 GB. ANSI is the default file format of PST files created in Microsoft Outlook 2002 and its earlier versions. While Unicode is the default file format of PST files created in Microsoft Outlook 2003 and its later versions. Due to such size limitation, if an ANSI PST file stores more information than its size limit, then risks for its corruption turn out to be high. The same issue can be knowledgeable about a Unicode PST file. A Unicode PST file can amass to 20 GB of mailbox data and in Outlook 2010 or later version, it can accumulate to 50 GB.

Helpful posts for Outlook users:

In order to avoid corruption in Outlook mailbox due to PST size limit, you can split PST file into multiple smaller parts. Refer to this blog post for more information – Easy Way to Split PST File into Multiple Smaller Parts

You can compress PST file by reducing its extensive file size. Once you successfully compact PST file size, it becomes smaller and easily manageable. Refer to this blog post for more information – Safely Compact PST File using Outlook Compact Feature

If you have a large PST file, you may confront issues while opening it.

  • A large PST file always takes enough time to be opened in Microsoft Outlook.
  • Your Outlook application may hang or work abnormally if you have large PST file.
  • And the worst impact is corruption in Outlook mailbox.

Why merge PST files?

Sometimes it may happen that an Outlook user has multiple Outlook PST files. This may cause severe issues related to PST management and its handling. If you have numerous PST files, it might be a challenging task to manage and handle them.

  • A large number of PST files may get misplaced somewhere or lost due to accidental deletion.
  • You need to open multiple PST files one by one if you want to access the mailbox information stored in them. It’ll definitely be a time-consuming process.
  • If you need to share the multiple PST files over the network, it takes a considerable measure of time in transferring the files one by one.

For every one of these circumstances, you have a superior choice. You can merge PST files into one PST file which is easy-to-manage, easy-to-share and easy-to-open in Microsoft Outlook.

merge PST files into one file

How to merge PST files Outlook 2010?

Microsoft Outlook client has no built-in feature or function to merge two PST files or multiple PST files directly into a single file. But you can try an easy manual trick to import mailbox content from multiple PST files into a single file. You can simply perform the manual trick by using Import feature of Microsoft Outlook client.

Step 1: Launch Microsoft Outlook on your system.

merge PST files in Outlook 2010

Step 2: Create a new Outlook data file.

merge PST files in Outlook 2010

Click New Items, point to More Items and click Outlook Data File….

Step 3: On the Create or Open Outlook Data File window, give a name to this new file.

how to create a new pst file

Click OK to confirm your action.

You can see the new Outlook data file in the navigation pane.

merge PST files in Outlook 2010

Step 4: Now click File tab > Open > Import.

merge PST files in Outlook 2010

Step 5: On the Import and Export Wizard, select Import from another program or file in the option. Click Next.

merge PST files in Outlook 2010

Step 6: On the Import a File window, select Outlook Data File (.pst).

merge PST files in Outlook 2010

Now click Next.

Step 7: On the Import Outlook Data File window, click Browse to locate the file and select it.

merge PST files in Outlook 2010

You can see the selected file in the edit box. Also, check the Do not import duplicates box, and then click Next.

Step 8: Select the folder to import from.

merge PST files in Outlook 2010

Check the box Include subfolders and Import items into the same folder in.

Finally, click Finish.

Step 9: Outlook starts importing the selected mailbox folder to new PST file.

merge PST files in Outlook 2010

Important note

It’ll take a couple of minutes (maybe more than that) to complete the process successfully. Now you can check the PST file created recently. As a result, you’ll see all the imported mailbox folders are available in this new PST file. Now you need to perform the same trick for other PST files as well.

Unluckily if the Outlook PST file is corrupt, you can’t import PST mailbox content from it manually. You must have a valid PST file in order to use the above manual trick. If PST files are valid, i.e. not corrupt, you can easily open the files and import their mailbox into a single file. But if the PST file is corrupt, you must repair it first.

The Inbox Repair tool, commonly known as scanpst.exe, is the best way to repair PST file. Refer to this blog post for complete information – Repair PST File by using Inbox Repair Tool (scanpst.exe)

Professional Solution to Merge PST Files

By using the above strategy, you can without much of a stretch merge PST files into a single file. This may take enough time in merging PST files as you need to perform each and every single step manually. Other than this, there’s one more choice to merge PST files. It provides you an easy, swift and highly convenient way to merge PST files unlike the manual trick (shown above). The PST Merge tool of SysInfoTools Software will help you merge PST files into a single file in just a couple of minutes. Here are few prominent features of this software:

  • PST Merge tool can merge PST files;
  • Two different options: Merge PST and Join PST;
  • Combine contacts in Outlook separately;
  • Support both ANSI and Unicode PST files created by any Outlook version;
  • Remove duplicate items and/or delete duplicate items in new PST file, etc.

Watch the online video tutorial below

25 Replies to “Merge PST Files into Single File – Combine PST Files Manually”

  1. Great site. Plenty of useful info here. I’m sending it to a few friends ans additionally sharing in delicious. And certainly, thanks for your effort!

  2. Hello, I check your blogs named “How to Combine Multiple Outlook PST Files into a Single File? | About N.Sem’s Blog” on a regular basis.Your doing what you’re doing!

  3. Informative blog!! You can also check out other third party applications to merge multiple PST files. As the manual process works well for limited PST files. With PST merge tool merge multiple PST files, folders, contacts, into single PST without losing any original information.
    Thank you.

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  5. What if there are duplicate messages? For example I have found a lot of PST files from all my users – some have over 40. (Not my fault! I’m new here!) I’m sure there are multiple copies of the same message across several PST files. Does the Merge function not import duplicates?

    1. You’ll get three options before merging:
      1. Replace duplicates with items imported
      2. Allows duplicates to be created
      3. Do not import duplicates
      You can select any of these options.
      Thank you.

  6. Hi There, I’m having this issue where error message “This outlook data file (.pst) is already in use in the current profile” pops out when I select the folder to import. Can you please help? I want to merge a few folder under 1.

  7. Is there a way to direct a copy of emails received in different PST to another PST -sub folders? Like –
    PST 1

    PST 2

    PST 3

    PST 4 (new)
    Folder pst1 emails
    Folder pst2 emails
    Folder pst3 emails

    1. Find the SCANPST.EXE here in these locations:

        In MS Outlook 2013: C:Program FilesMicrosoft OfficeOffice15
        In MS Outlook 2010: C:Program FilesMicrosoft OfficeOffice14
        In MS Outlook 2007: C:Program FilesMicrosoft OfficeOffice12
        In MS Outlook 2003: C:Program FilesCommon FilesSystemMSMAPI
        In MS Outlook 2002/XP: C:Program FilesCommon FilesSystemMAPI\scanpst.exe
        In MS Outlook 2000: C:Program FilesCommon FilesSystemMAPI\NTscanpst.exe
        In MS Outlook 97/98: C:Program FilesCommon FilesWindows Messagingscanpst.exe


  8. Helpful post, but anyone having the problem of the PST being currently in use, then ensure that the PST is closed within Outlook otherwise it cannot be used. To do this right click the archive folder and choose ‘Close’.