If you want to export PST files to MBOX file format, you can try ZOOK PST to MBOX Converter software that would be definitely helpful for you to export PST files to MBOX in quick manner. It is purely dedicated and risk-free solution to convert or save PST to MBOX. You can easily export Outlook PST emails, contacts, notes, journals, etc into MBOX email clients like Mozilla Thunderbird, Entourage, Netscape, Yahoo Mail, Opera Mail, Apple Mail and many others. This software is 100% secure and free to convert up to first 24 PST emails.
Read more- https://www.zooksoftware.com/pst-to-mbox/