Read time 10 minutes

Microsoft Outlook is an extensively used personal information manager which uses the PST (Personal Storage Table) file format to store calendar events, contacts, journals, notes, tasks, and web browsing information. PST files reduce the amount of data being stored on email servers. However, after a point, even the PST files exceed the maximum size limit of mostly 50GB. The increase in the size of PST files leads to rising issues in Outlook, which gives rise to the need to split these PST files.

What is the need to split PST files into smaller parts?

The increase in the size of PST files to the extend of its maximum file size starts affecting the day-to-day functioning of MS Outlook. The smooth functioning work can get disturbed. These are the reasons behind the need to split larger PST files into parts-

  1. The functioning and pace of Microsoft Outlook slow down.
  2. If the PST file exceeds its maximum capacity, the data it contains can become inaccessible.
  3. Storage of more data becomes difficult.
  4. Users face issues in sending and receiving messages.
  5. By splitting the PST file into smaller ones, the data can be organized in a better way.
  6. There is a huge risk of losing the data which the PST file contains.
Manual methods to split PST files into smaller parts
  1. Manage large PST files using the ‘Import/Export’ option
    The Import/Export option is widely used for various tasks in MS Outlook. Its prime task is to move files in and out of the application. However, it can prove to be handy when it comes to splitting PST files into smaller parts.Follow these steps to efficiently split PST files using the Import/Export feature:

    1. Open Microsoft Outlook on your computer system and click on the ‘File‘ tab from the menu.Open Microsoft Outlook
    2. Click on ‘Account Settings’ under the same tab.Account Settings
    3. A new dialog box will open. Click on ‘Add’ under the ‘Data Files’ section.Add Data Files
    4. To create a new PST file, type the name and choose ‘Outlook Data File’ as the file type. Finally, click on ‘OK.’create a new PST file
    5. You can easily view the newly created PST file under ‘Data Files.’
    6. Again, click on ‘File.’ Select ‘Open & Export’ from the left tab and then click on the ‘Import/Export’ option.Import/Export
    7. An ‘Import & Export Wizard’ dialog box will appear. Click on ‘Export to a file’ and then ‘Next’.Export to a file
    8. Now, select ‘Outlook Data File (.pst)’ and click on ‘Next’.Select Outlook Data File
    9. Choose the folders and make sure to tick the checkbox of ‘Include subfolders’ and click on ‘Next.’Choose the folders
    10. Choose a destination to save the exported files and highlight the option of ‘Do not export duplicate items,’ and click on ‘Finish.’Choose a destination to save the exported files
  2. Manage large PST files using Archive feature
    Another way to split and manage large PST files is by using the ‘Archive’ feature to clean out old items.Follow these steps to use the Archive feature to manage PST files:

    1. Launch the MS Outlook on your system and click on ‘File.’
    2. Select the ‘Info’ tab and click on ‘Mailbox Settings.’ A drop-down menu will appear, and click on ‘Clean up old Items.’Mailbox Settings
    3. Select the folder and date to archive and click on ‘OK.’Select the folder and date to archive
  3. Manage large PST files using the ‘Move to Folder’ option
    ‘Move to Folder’ feature in MS Outlook can also be used to split large PST files into smaller ones.Follow the steps for easy navigation:

    1. Click on ‘File.’ Go to ‘Account Settings’ under the ‘Account Settings.’Account Settings
    2. Click on ‘Add’ under the ‘Data Files’ section.add data file
    3. Return to the home screen and click on ‘Move’. Then select ‘Copy to Folder’.select Copy to Folder
    4. Choose the PST file to move the selected data into the new one.move pst in new
    5. The copied items can be deleted to reduce the size.
Why users do not choose manual methods

Manual methods to split PST file have an advantage as they are free of cost. However, they do tend to be complex to split PST files into smaller ones. These are a few setbacks due to which users do not opt for manual methods to perform this task-

  1. To begin with, it is a time-consuming process.
  2. There are high chances of losing important data permanently.
  3. In addition, there is no guarantee of integrity and security of data in the PST files.
  4. These methods are not beginner-friendly. They require the users to have a decent understanding of Outlook.
Opt for a professional approach

All the shortcomings of manual methods are brilliantly resolved by professional tools. One such tool is the Kernel for PST Split, which provides a unique and premium approach to split oversized PST files into smaller ones. It is ideal since it lets the users split PST files into smaller ones based on 5 factors- date, size, folder, sender email ID, and a separate PST file for all selected folders. There is full accuracy and integrity of data throughout the process. It is a well-compatible software with all versions of MS Outlook Office, including Office 365, 2019, 2016, 2013, 2010, 2007, 2003, 2002, 2000, 98, and 97.

Follow these simple steps for a hassle-free split of PST files

  1. Install the Kernel for PST Split.
  2. You can browse and select the PST file.browse and select the PST file
  3. The selected file will be displayed. Tick the checkbox and type the password if the file is password protected, and select ‘Next’ to proceed.display the selected files
  4. Select the basis on which you want to split the PST file. Click on ‘Next.’
    Here, ‘Split PST file on basis of Date’ has been selected.Split PST file on basis of Date
  5. Set the parameters for the the split.Set the parameters
  6. Choose the location to save the smaller PST files.Choose the location to save files
  7. The splitting process will be completed in a jiffy.splitting process completed


PST files store all the data in Microsoft Outlook, including tasks, events, contacts, notes, and web browsing information, due to which its size tends to exceed the maximum capacity. A large PST can slow down the functioning pace of Outlook. In addition, there is a high possibility of data getting lost or inaccessible. The storage of new data can turn into a tough task. Due to these reasons, there is a high need to split the PST file into smaller ones. This can be done using the Import/Export option, Archive, or Move to Folder feature present in MS Outlook itself. However, manual methods do bring along a few shortcomings as well. To maintain the integrity of data, a best Outlook PST Splitter tool like the Kernel for PST Split is recommended.

Kernel for PST Split