Learn to Split Outlook Data File Easily – Rapid Way to Divide Oversized PST

Anurag | March 10th, 2018 | General

If you are using Microsoft Outlook for a long time then there is a possibility that the size of your Outlook PST file would be so large. If the size of the PST file has increased so much then you may encounter performance issues while working with Microsoft Outlook. It starts working abnormally, and there can be chances of the sudden shut down of email application or may find it in the hanged state. Moreover, PST files are prone to corruption and any damage to those files can cause loss of entire mailbox data. So, to split oversized PST file, follow this article and know how to split Outlook data file using best tips and tricks.

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What is PST File?

Basically, PST file i.e. Personal Storage Table is a central repository of Outlook elements which includes emails, calendars, contacts, tasks, notes, journals, etc. There are two types of PST files i.e. ANSI and Unicode files. The ANSI PST file has a predefined storage limit of 2 GB and it is supported by Outlook 2002 and earlier versions of it. On the other side, Unicode PST file has remarkably increased storage capacity and it is supported by Outlook 2003 and later versions of it.

After knowing about Outlook file, let us now discuss the methods to divide large sized PST file.

How to Split Outlook Data File Manually

Archive Oversized PST File

Archiving older Outlook PST file not only helps to reduce the size of a mailbox but also divides PST file in smaller segments. The steps to archive the Outlook mailbox are mentioned in the following section:

  1. Open Microsoft Outlook.
  2. Choose the PST file which you need to split.
  3. Click on File tab and select Info.
  4. Now, Select Cleanup Tools.
  5. Choose Archive from the available options.
  6. After that, a dialog box will appear. Select “Archive this folder and all subfolders” option.
  7. Now choose a folder from the list.
  8. Next, the option Archive items older than will appear. Choose proper dates from calendar.
  9. Click Browse to select the destination location of new file.
    Note: The default name of the resultant file is Archive PST. After providing storage location, Click OK button.

Import and Export to Break Data

You can break PST file into smaller parts using the in-built Import and Export feature. So, to know how to split Outlook data file, follow the steps mentioned below:

  1. Open Microsoft Outlook.
  2. Create a new Outlook file.
  3. Click on File tab, choose More Items,
  4. A Create or Open Outlook Data File window will open. Provide the storage location for the resultant file.
  5. Click OK.
  6. You can now access the newly created Outlook PST file in the application window.
  7. Now, Click File tab and then open and select Import.
  8. A window will appear. Choose Export to a file option from the list and click Next.
  9. Select Outlook Data File (.pst) and click Next.
  10. After that, select the folder that you need to export data from and select Next.
  11. Now, click Browse button to choose the folder in which you want to export data.
  12. Open Outlook Data Files window will appear. Choose the file to which you want to export data and click OK.
  13. Now, choose a proper option from the given alternates and click on Finish.

How to Split Outlook Data File Effortlessly

The manual methods discussed in the above section helps user in breaking the large sized Outlook PST file into smaller parts. But these procedures may appear as a challenge for novice users. Another aspect of executing these steps is that these procedures are so time-consuming as well. So, to divide oversized PST file hassle free, it is always suggested to use an automated solution which is designed specially to break big PST files into smaller segments.


After reading this article, now users know how to split Outlook data file into small segments using multiple ways. Users can choose the desired solution which best suits their requirement. As manual methods have some limitations such as it is time-consuming as well as technical expertise is required. Hence, there is a need for the above-mentioned third-party application to make the entire process trouble-free.