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Reducing PST Size with Import/Export Process
Import/Export wizard is not only used for moving data files to and from MS Outlook, but it also is used to split PST file in MS Outlook.

Following are the steps mentioned that will guide you to complete the splitting of PST files:

Step 1: Launch MS Outlook, click File from the menu bar.

 Launch Outlook

Step 2: Navigate to Account Settings >> Account Settings

Account Setting

Click Add button under Data Files tab from the dialog box.

Add button in Data Files

Step 3: Enter name and type as Outlook data file (.pst) and click OK to create a new PST.

create a new PST

Step 4: You can view the new PST under Data Files

Step 5: Now, click File >> Open & Export >> Import/Export.

view the new PST

Step 6: Select Export a File in Import and Export Wizard and click Next button.

Import and Export Wizard

Step 7: In Export File windows select Outlook Data File (.pst) and click Next button.

Select Outlook Data File

Step 8: Choose folders to export and check the Include Subfolders option if you want to export subfolders.

Choose folders to export

Step 9: Now, browse to select to select the saving location of the exported file and choose from options to disallow exporting duplicates items. And, click Finish

select the saving location

Step 10: Set a password for exported PST file or if you want you can cancel it simply.

If you are looking for a solution to split oversized Outlook PST files, you can simply download the best Split Outlook PST Tool. The software successfully splits large PST files and divides them into different smaller parts. The software keeps the data hierarchy intact while performing the split task. it easily breaks large PST files without any data loss and does not compromise your file size you can easily handle all the processes, there are available free demo versions of the software. This software work with all MS Outlook versions 2019, 2016, 2013, 2010, 2007, 2003, etc.

Download the MacSonik PST splitter tool for Mac to split the oversized PST files easily. This tool efficiently removes any duplicate emails from the splitting process of selected PST files without any data loss. Mac users can convert both passwords protected and without password-protected PST files without any hassle using this tool.  The PST splitter offers users to select the desired size to split the PST files. 

Steps to split oversized PST files - 

1. Launch the PST splitter tool for Mac.
2. Click on Ad file and add PST files/folder.
3. Choose the desired criteria to split the PST files.
4. Tap on split to initiate the splitting process.