How to Divide Big PST File into Smaller Parts? – Everything You Need To Know

We all are well aware with the issues when the size of the PST file exceeds its maximum limit. The more the size, it becomes difficult to manage it. So, there are some methods that can be adopted to avoid the Outlook PST file’s size issue. Large PST files also deteriorates the performance of the Outlook. In this article, you will get the best techniques to divide big PST file into smaller parts using the manual method and an automated tool i.e. PCVITA Split PST File Tool.

Why is it Necessary to Reduce the Size of PST File?

  • The most important reason to truncate PST file is that it starts running out of space.
  • If the permissible limit exceeds then the data of the PST files becomes inaccessible for the users.

Solutions to Divide big PST file into smaller parts

There are two ways in which you can break a PST file:

  1. Manual
  2. Third-party tool

Manual Method to Break Oversized PST File

There is no inbuilt feature provided by the MS Outlook that helps to reduce Outlook mailbox size 2016, 2013, 2010, 2007 and other below versions.

Let’s have a look and learn about the techniques.

Method 1: Reduce the PST File with Import/Export Process

Step 1: Open MS Outlook. From the menu bar, click “File.”

Step 2: Go to “Account Settings” and click to “Add files.” Enter the name like abc.pst and then click “OK.

Step 3: Now, you can view your PST file.

Step 4: Click “File” and then select “Open & Export” and after that select “Import/Export.”

Step 5: Select “Export to a file” from the wizard and click “Next.

Step 6: Select “Outlook Data File(.PST)” and after that select “Next

Step 7: Choose the folder where you want to export the file and check the “Include Sub-folders” if you want them to be included.

Step 8: Lastly, select the saving location of the exported file and apply the password if you want to, otherwise, click “Cancel.”

Method 2: Use Move to Folder option to Truncate PST file

Step 1: Launch Outlook. From the file menu go to “Account Settings”.

Step 2: Select “Data Files” and then click on the “Add button” to add a new PST file.

Step 3: Open the default PST file of your MS Outlook profile and select the items that you want to move. Now, from the ribbon, click the “Move” button and select “Copy to Folder.”

Step 4: Choose a file so that all your selected data will move to your default PST file.

Step 5: Now, you can delete the duplicate items from the default file in order to divide big PST file into smaller parts.

Method 3: Use Archive File to reduce the size of PST File

Step 1: Open MS Outlook. “Select Info” and then go to “Tools” and lastly to “Clean Up Old Items”

Step 2: Select a folder that you wan to Archive. After this select the date and click “Browse.”

Step 3: After this click “OK” and save your file at the desired location.

Drawbacks of the Manual Method to Break Oversized PST File

This method is a lot time consuming and requires technical expertise to perform it. There is no guarantee of data security and data integrity. The chance of data loss is high in the manual method. The user can not completely rely on this blindly to reduce the size of PST file.

Best Method to Divide Big PST file into Smaller Parts

The manual method to truncate PST file is a bit tricky and requires professionalism. But, if you are looking for a better and quick solution then, switch to Split PST Software. This tool is trusted by the experts and has a user-friendly interface. This utility can be used to reduce Outlook mailbox size with 100% accuracy and without worrying about data loss.

Steps to Reduce the Size of PST File

Step 1: Download PCVITA PST Split tool and launch it on your system.


Step 2: Click on the “Split” button after opening the software.

divide PST

Step 3: Now, select the version of your MS Outlook and also the split options like split by date, size, year and folder as per your need.

Divide PST by size, date, year and folder

Step 4: Select the Outlook PST file and also specify the size.

Specify the Size

Step 5: Select the destination by clicking on Browse. Click on “Split” button and the software will begin the process.

Click Split

Step 6: After the process to break oversized PST file is completed, check the final PST files from the selected location.


In this article, we have discussed the manual and a third-party solution to divide big PST file into smaller parts. Although, the manual solution has its own limitations that we have already discussed. If you are looking for a better, reliable and quick solution to reduce Outlook mailbox size ,then use the automated technique. It is a cost effective and efficient tool with the guarantee of no data loss.