To convert PST to MBOX, you can use the MacSonik PST Converter for Mac. This software converts Outlook PST to MBOX and other file formats such as PDF, EML, EMLX, MBOX, HTML, MSG, DOC, etc. Also, this tool migrates PST to Gmail, Office 365, IMAP, iCloud, Thunderbird, and other email clients. This tool can facilitate the feature, including removing duplicate emails, backing up emails without attachment files, and renaming the resultant file, etc. Additionally, this software is compatible with all Mac OS platforms.

To Know More: https://www.macsonik.com/pst/converter/