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When the size of the PST file exceeds the maximum file size limit, it could push you towards unfavorable situations of data loss and broken data items. The more a PST grows in size, the more it becomes a major reason of concern for Outlook users. So, you must adopt some methods to maintain Outlook PST file’s size and control your system from running out of space. Nowadays, PST files are more vulnerable to corruption as they run in Unicode format and large PST size also degrades the performance of Outlook.

Therefore, we have suggested possible workarounds for splitting large PST file into several small PST files. The methods are universally applicable to all version of Outlook 2019, 2016, 2013, 2010, and 2007 mailboxes.

Why You Need Splitting Large PST File?

There are different reasons for splitting large PST files, some of the common reasons are mentioned below:

  • Due to the huge size of the PST file size, the performance and speed of MS Outlook starts to slow down.
  • Users are denied storing data items to the folders of PST file if the PST file is out of space or it is left with very limited storage space.
  • A large PST file when exceeds its permissible limit makes the data of PST file inaccessible for users.
Instant Solution

Try automated tool Kernel for PST Split for splitting oversized PST files in MS Outlook 2019, 2016, 2013, 2010 and previous version.

Manual Techniques to Split Oversized PST File

There is no inbuilt tool offered by MS Outlook for splitting large-sized PST files. Therefore, we found workaround methods that can be performed manually to resolve the issue of splitting PST files in Outlook 2019, 2016, 2013, 2010 and 2007.

  1. Reducing PST Size with Import/Export Process
  2. Use Move to Folder Option for Managing Large PST File
  3. Use Archive Wizard for Reducing PST File Size

Method 1: Reducing PST Size with Import/Export Process

Import/Export wizard is not only used for moving data files to and from MS Outlook, but it also is used to split PST file in MS Outlook.

Following are the steps mentioned that will guide you to complete the splitting of PST files:

Step 1: Launch MS Outlook, click File from the menu bar.

 Launch Outlook

Step 2: Navigate to Account Settings >> Account Settings

Account Setting

Click Add button under Data Files tab from the dialog box.

Add button in Data Files

Step 3: Enter name and type as Outlook data file (.pst) and click OK to create a new PST.

create a new PST

Step 4: You can view the new PST under Data Files

Step 5: Now, click File >> Open & Export >> Import/Export.

view the new PST

Step 6: Select Export a File in Import and Export Wizard and click Next button.

Import and Export Wizard

Step 7: In Export File windows select Outlook Data File (.pst) and click Next button.

Select Outlook Data File

Step 8: Choose folders to export and check the Include Subfolders option if you want to export subfolders.

Choose folders to export

Step 9: Now, browse to select to select the saving location of the exported file and choose from options to disallow exporting duplicates items. And, click Finish

select the saving location

Step 10: Set a password for exported PST file or if you want you can cancel it simply.

Method 2: Use Move to Folder Option for Managing Large PST File

You can also opt for another workaround method to split large-sized PST files using the Move to the Folder option. Navigate using the step by step procedure mentioned below:

Step 1: Launch Outlook, click File tab >> Account Settings >> Account Settings.

Launch outlook

Step 2: Click the Data Files and click on the Add button to add a new PST file.

add a new PST file

Step 3: Go to Home and open the default PST file of your Outlook profile and select the items you want to move to a new PST file you create in Step 2.

Step 4: To do so, click the Move button from the ribbon and select Copy to Folder.

Copy to Folder

Step 5: Choose the PST file, so that all the selected data items from the default PST file can be moved to the new one.

Choose the PST file

Step 6: You can delete the copied items from the default PST file so that its size gets reduced.

Method 3: Use Archive Wizard for Reducing PST File Size

You can use Archive Wizard for splitting large-sized PST file in Outlook. Follow the simple steps as mentioned below:

Step 1: Start MS Outlook, open File >> Info >> Tools >> Clean Up Old Items

Clean Up Old Items

Step 2: Select a folder to Archive, choose a date to Archive older items and click Browse to save the Archive file to the desired location.

save the Archive file

With the help of this technique, you can reduce the size of PST file and save older data items to the desired location one by one within Outlook and use them when required.

Limitations of Using Manual Techniques for Splitting PST File:

The manual methods mentioned above to perform splitting of large PST files have different limitations for the users of Microsoft Outlook.

  • The process is time-consuming and lengthy to perform.
  • Data security and integrity is not guaranteed.
  • Chances of data loss are high.
  • You cannot rely on the techniques blindly to split PST file.
  • Required skilled technical expertise to
Best Technique to Split PST File without Outlook:

The manual techniques to split large size PST files works efficiently and helps to avoid corruption and error issues. But, if you are looking for a solution that performs quickly and does not require the installation of Outlook on your system for splitting PST files, a third-party tool is the best fit. There are many tools that are available in the market, but the one that is recommended trusted by IT experts for PST Split procedure conveniently is Kernel for PST Split.

This utility is your one-stop solution for splitting PST files with 100% accuracy and without worrying about data loss. You can easily use the tool to split Outlook data items such as emails, contacts, calendars, tasks, etc.

Follow the steps given below to split a bulky PST file:

  1. Open Kernel for PST Split.
  2. Click Browse to select the PST data file you want to split and click PST data file
  3. Note: If the PST is secured with a password, checkmark the File is password protected option and input password in the same window.

  4. Once the PST is loaded, you’ll see all the mailbox folders in the left side of the window.
    Select the Split PST file based on date option and click split pst file
  5. Note: For demonstration purpose, we’ve selected Split PST file based on date option; you can select any option as per your preference.

  6. Once you have selected the split option, you can define the parameters to split the file; click Next.choose split option
  7. Note: You can define a date range manually as well.

  8. Now, browse for file-save location, and click Ok.browse for file save location
  9. Wait for the splitting and saving to to complete
  10. Note: In case if you wish to make some changes, click Stop.

  11. When splitting and saving is complete, click Finish.Process Finished

You’ve split PST file into same size proportions as per the setting in Step-3 & 4.

Final Words:

As we mentioned, there are multiple techniques to split oversized PST files in MS Outlook that cross permissible storage limits or that are about to reach maximum storage size limits. Therefore, for your comfort and convenience, we have mentioned both manual and automated techniques. As you can see manual methods are not direct methods to split PST files, they are just temporary workarounds, whereas the professional tool method is the best option to split PST file hassle-free.


Kernel for PST Split