What’s the Best Way to Divide Large PST Files?

Written by lucasjones  »  Updated on: April 07th, 2025

Now, every user asks the same question: Why do we have to divide large PST files into smaller pieces?

The response to your query is that this problem might have several causes.

Though oversized PST files are one key reason customers usually desire to split their files into several sections, there are many other reasons for this, which we will discuss in the next section.

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Why Should You Divide Large PST Files Into Parts?

The following explains the necessity to split the PST files into sections:

  • The primary cause is that Outlook's general performance suffers when the data file runs beyond its storage capacity.
  • This implies that one runs a great risk of losing effective data.
  • Mail forwarding and receiving might also cause problems.
  • You can also have problems sending and receiving mail.
  • Separating your PST files into smaller pieces will help your data to be more orderly
  • Users also run the risk of losing information connected to their PST files.

Techniques for Divining a Large Outlook PST File by Year, Date

Large PST files can be split into two, either physically or virtually. You can split the data file using any method that fits for you. Let's begin:

#1. Using Import/Export Wizard

Follow these below-listed instructions:

  • Using this approach, first go to the File menu and then choose Account Settings.
  • A dialog box would then show on the screen. Click the Add choice beneath the Data Files part.
  • You next have to create a fresh data file, and for this, you must name your file. Press the OK button following the file names.
  • Your regenerated PST file will be pre-viewable under the Files menu by doing this.
  • After that, click on the Import/Export button from the File tab, from the left lane, select open, and then appear.
  • On your screen, the Import/Export dialog box will show up now. Click Next after first selecting Export to a file option.
  • Choose the Outlook data file (.pst) and then hit the Next button.
  • Click the Next button after selecting the folder, reviewing the Included-folders option from the drop-down list.
  • After that, highlight "Do not Export duplicate items" and press the Finish tab after selecting your path of destination to save the data.

#2. Divided Large Data Files Using Archive Feature

Use these below-listed guidelines to divide large PST files into smaller sections:

  • Regarding this, go to the File menu in Outlook after opening it.
  • After selecting the Info tab, go to Tools Clean Up Old Items.
  • Here you may choose the folders to archive. Next, make sure you choose a date from the Archive Items folder.
  • Click the browse option and then choose a preferred spot to save the file.
  • Clicking the OK button will help you to finish the process.

Apart from the insane ones, there are many more techniques to divide large PST files into tiny pieces. Still, the techniques are always free; you pay nothing for them. Using this approach, though, you run the risk of losing your data. Furthermore, one has to possess the technical ability to follow these kinds of approaches.

We advise you to use any outside option that would yield correct data to prevent such conditions. In the next part, we will provide a straightforward yet efficient method for splitting big data sets.

Professional Approach to Dividing a Big Outlook PST File Year and Date

As we have already discussed, there are several outside programs accessible to assist you with this work. The Softaken Split PST Software is one such fix that lets users split their PST data into several portions. The application offers the choice to split the data file according to size, date, year, folder, email, and category. Apart from that, it works with all presently available and past Windows operating system versions.

Follow these few steps to split Outlook PST files:

  • Download and Install the Softaken Split PST tool on your system.
  • Open the application from your desktop.


  • To split a huge PST file, hit Add File and choose the file.
  • Choose how you wish to divide the file: in terms of size, date, and folder.


  • Decide where to save the divided data.
  • Let the tool procedure the file by clicking the Split Now button.


  • After you’re done, check for the divided files in the destination folder.

Just using the sample version will let you separate the first few things for free using this software. You may also get the whole edition to divide large PST files without any problems.

Let’s End Here

This page shows how users can divide a sizable Outlook PST file by year and date. We have so discussed both automatic and handcrafted methods. However, manual methods might take a lot of time, hence you run a great risk of losing your data. Therefore, the preferable choice would be to make use of the suggested automatic application.


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