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Oversized PST files cause corruption, slow performance,  and many problems in Outlook. To avoid all these issues, splitting large Outlook PST file into smaller files is the best idea. Almost all Outlook users faced large PST file problem and looking for a solution to split big PST file into multiple smaller PST files. This blog describes how can a user easily reduce the size of PST file. Here we explain two methods, Manual and Automated to perform this task.

As we all know that Outlook is the most demanding email client application all over the world. Outlook supports to export data in PST file which includes emails, contacts, notes, calendars data and many more. In the latest versions of Outlook like Outlook 2013, 2016, 2019, the Microsoft increases the size limit of PST file is up to 50 GB. 

Why Need to Split Big PST File into Multiple Smaller PST Files?

To get rid of the data corruption issue, the best way is just split PST file into smaller parts. Here are some benefit of splitting large sized PST files:-

  1.  To prevent Outlook data from data corruption issue due to oversized PST files.
  2.  Maintain the speed of MS Outlook application to store smaller size PST files.
  3.  To avoid Outlook stops sending/receiving emails error due to large-sized data files.

Methods to Split Oversized PST File of Outlook Mailbox

Usually, there is no direct or manual method in Outlook to split big PST file into multiple smaller PST files. However, some indirect ways are available that are helpful to perform this task such as Import/Export, Archive and Move to folder. 


#Method 1. Using Import and Export Option to Move PST Files

Step 1. Launch Outlook, Go to File >> Account Settings >> Account Setting

Step 2. Now a dialog box will appear, select Data Files tab and click Add button.

Step 3. Again a new dialog box will open, here name the PST file and select the store to save PST file.

Step 4. Click OK.

Step 5. Again go to the File tab, click Open >> Import

Step 6. In the Import and Export Wizard, select the Export option and click on the Next button.

Step 7. Select the PST file and click the Next button.

Step 8. Choose the folder to export from Expand the Folder window and select items to export. Click Next

Step 9. Browse and select the location where you want to save the PST file and name it.

Step 10. Choose the suitable option and click on Finish.

Step 11. ‘Create password for PST’ window will appear. If you want to create a password-protected PST then, enter a password otherwise click on the Cancel button.

Step 12. A new PST file will be created.


#Method 2. Archive Feature To Reduce the Size of PST File

Step 1. Open Outlook and select the PST file from which to move data to anew file.

Step 2. Click on the File tab and select Archive.

Step 3. In the Archive dialog box, check on the checkbox Archive this folder and all subfolders

Step 4. Select the folders want to move from the list

Step 5. Now, in the Archive items older than option, select the date from the calendar

Step 6. Browse to choose a location and name of the new PST file.

Step 7. Click OK and you have created a new PST at the desired location.


#Method 3. Using Move to Folder Option

Step 1. Go to the File >> New >> Outlook Data File

Step 2. A dialog box will open, here select the oversized PST file that needed to be split and click on OK.

Step 3. Type an appropriate name for this new PST file in the Create Microsoft Personal Folder wizard.

Step 4. Choose one or more folder to move in this newly created PST file.

Step 5. Now, click on the Edit menu and then click Move to Folder option.

Step 6. In the Move Items box, click on New button.

Step 7. Create New Folder window will appear. Here type a name for this folder.

Step 8. In the Select where to place the folder’ option, select the new PST file and click OK.

Step 9. You must select the new folder in the new PST file in 'Move items' and click OK button.


Secure Software to Split Big PST File into Multiple Smaller PST Files

If all the above methods are not properly split PST file or you feel that the method is time-consuming, then must try SysTools Split PST Tool. This is one of the best and expert suggested software to split oversized PST file into smaller parts. It is 100% safe & secure application and offers an easy-to-use interface. The tool supports PST file of Outlook 2016, 2013, 2010, 2007 and all earlier version for splitting. 


Steps to Split Outlook PST File Using PST Splitter Tool

Step 1. Download and Launch the software

Step 2. Select Outlook format and Split option- Split by size, date, folder, year.

Step 3. Browse to select Outlook PST file and specify the size of the file.

Step 4. Click on Browse button and choose the desired location to save final PST files and click Next.

Step 5. Hit the Split button to start split big PST file into multiple smaller PST files process.


Final Words

Splitting oversized PST files is an effective process to avoid PST data file corruption. To accomplish this task, we mentioned all the possible solutions. If the manual solution does not work to split big PST file into multiple smaller PST files, you can simply opt the suggested software. This software split PST file into smaller files and reduce the size of PST file with complete safety.