Do you want PST to MBOX file conversion? You will finish your search with this eSoftTools PST to MBOX Converter Software. This program, which includes a live preview of PST emails, is user-friendly and has a free demo, converts PST files to an advanced MBOX file without problems. Up to 25 email items can be converted into each folder in the demo edition.
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How to Convert PST to Mbox
Download Mozilla Thunderbird on the machine that you have Outlook installed on.
Install, then open Thunderbird.
Go to the File Menu and select Import.
Download LibPST, which is a free and open source command line utility that runs in Linux and MacOS X and converts PST files to MBox formats.
Regards,
Willjoe