To convert PST to MBOX on a Mac, you have three reliable options depending on your setup and scale of data. For a free, manual route, import the PST into Outlook for Mac, then drag exported mailboxes to Finder; Outlook saves them as MBOX you can use in Apple Mail or Thunderbird. If you don’t have Outlook on Mac, use an IMAP bridge: import PST into Outlook on any machine, sync to a Gmail/IMAP account, then export mail as MBOX via Google Takeout or from Thunderbird after syncing; this preserves folders but takes longer and needs stable bandwidth. For faster, large, or mixed PST (ANSI/Unicode) migrations, dedicated Mac converters support batch conversion, metadata, attachments, and folder hierarchy—examples include vMail
PST to MBOX (Mac), vartika Outlook to MBOX (Win/Mac workflow), Mailvita (Mac), and similar utilities that preview, filter, and handle big files without Outlook dependency.
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https://www.vsoftware.org/mac/pst-to-mbox-converter.html
