How to Split PST Files by Size in Outlook

Still, wondering how to split PST files into smaller Size? Several users look on the internet to find a secure and reliable tool to break, combine, crack and split PST files. Do not worry and keep reading the blog as we have compiled a list of the top reasons why users split PST files. This blog explains teh manual steps in detail to split PST files and also suggests a safe PST splitter tool to quickly combine and split PST files into similar size without Microsoft Outlook.

Discover the Top Reasons Why A User Split PST Files

Splitting PST files can be beneficial for a variety of reasons, mainly aimed at improving the performance, manageability, and organization of your Outlook data. Here are some key reasons why a user might consider splitting PST files:

  • Performance Enhancement: Larger PST files can slow down Outlook’s performance, causing delays when opening emails, searching, or performing other tasks. Splitting large PST files into smaller ones can help improve overall performance and responsiveness.
  • Avoiding Corruption: Large PST files are more prone to corruption. By splitting them, you reduce the risk of data loss due to file corruption, ensuring that even if one smaller file gets corrupted, the others remain intact.
  • Simplified Backup and Restoration: Smaller PST files are easier to manage when it comes to backup and restoration. Backing up or restoring smaller files is faster and less error-prone.
  • Easier Archiving: When you need to archive old emails, having smaller PST files makes the process more manageable. You can archive specific time periods or categories more easily.
  • Better Organizational Structure: Splitting PST files based on themes, projects, or departments can provide a more organized and logical structure for your data, making it easier to find what you need.
  • Avoiding Outlook Limitations: Different versions of Outlook have varying limitations on PST file sizes. Splitting PST files ensures that you stay within the limits of your Outlook version.
  • Data Recovery and Repair: In the event of data corruption or a problem with one PST file, having smaller files makes it easier to recover data or perform repairs without affecting other data.

It’s important to note that while splitting PST files offers several advantages, it’s also essential to manage and organize your split files effectively to maintain a coherent email system. If you decide to split PST files, consider a clear naming convention and folder structure to ensure you can easily locate specific data when needed.

Know How to Split PST to Outlook By Year with Using the Manual Process

Splitting PST files manually involves creating new, smaller PST files from a larger one. Here’s a step-by-step guide on how to manually split PST files using Microsoft Outlook:

  • Create a Backup: Before you start splitting your PST file, it’s crucial to create a backup of your original PST file to avoid data loss in case anything goes wrong during the process.
  • Open Microsoft Outlook: Open Microsoft Outlook on your computer.
  • Create a New PST File:
  • Access Data File Management:
    • In Outlook, go to the “File” tab.
    • Click on “Account Settings” and then select “Account Settings.”
  • Open Data Files Tab:
    • In the “Data Files” tab, click “Add.”
  • Choose Outlook Data File (.pst):
    • Select “Outlook Data File (.pst)” and click “OK.”
  • Choose Location and Name:
    • Choose a location to save the new PST file.
    • Enter a name for the new PST file (e.g., “Archive_Part1.pst“) and click “OK.”
  • Move or Copy Data:
  • Select Items to Move/Copy:
    • In the original PST file’s folder structure, select the items you want to move or copy to the new PST file.
  • Drag and Drop:
    • Drag and drop the selected items from the original PST file to the corresponding folders in the new PST file.

Step 5: Repeat for Additional PST Files: If you need to split your data into multiple smaller PST files, repeat the above steps to create additional new PST files and move/copy items as needed.

  • Remove Items from Original PST: After moving or copying items to the new PST files, you can choose to remove those items from the original PST file to reduce its size. Right-click on the items and select “Delete.”
  • Compact PST Files: To recover space from the original PST file and the newly created PST files: Access Data File Management:
    • Go to the “File” tab.
    • Click on “Account Settings” and then select “Account Settings.”
  • Open Data Files Tab:
    • Select the PST files you want to compact.
    • Click on “Settings” and then click “Compact Now.”
    • Test and Verify: Before you consider the splitting process complete, ensure that all items have been successfully moved or copied to the new PST files and that your Outlook folders are organized as desired.

Organize and Maintain: Keep the new PST files organized and consider implementing a naming convention or folder structure that helps you quickly locate specific data when needed.

Please note that manually splitting PST files can be time-consuming, especially if you have a significant amount of data to move. If you’re dealing with a large dataset, consider using specialized third-party tools that can automate and streamline the splitting process. Always make sure you have backups of your data before making any changes to your PST files.

A Safe and Reliable Way to Split PST files by Using PST Splitter Tool

We suggest our readers split PST files quickly and in no time by using a reliable PST Splitter tool. KDETools PST Splitter tool is one of the best and most advanced tools available in the industry that ensures a seamless process to split PST files. The tool is loaded with an array of robust features that make the process faster as opposed to its alternatives. The users can split PST files by size, date, and folder and complete the process in no time.


This blog explains the manual steps to split PST files and also suggests a reliable PST splitter tool that ensures a safe and quick process. Read the blog to know the top reasons why many users prefer to split PST files.

Download PST Splitter Tool:

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