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Read more:- Convert PST File to MBOX File Format
Launch Mac Outlook 2016 or 2011 version on Mac system.
Click on File >> Import.
Select “Outlook Data File (.pst or .olm)” option and click right-arrow.
Choose Outlook for Windows Data File (.pst) >> click on right-arrow icon.
Go to the location of PST file and select it.
Click on Import and the PST file data will be moved into Mac Outlook.
Open the home screen of Mac Outlook and under On My Computer section, the imported file can be found.
Drag this folder to Mac desktop and the file will get saved in MBOX file format. This file can be imported into Apple Mail using its native import option.