I would like to recommend you this professional Outlook PST to MBOX Converter Software that can efficiently convert and migrate single or multiple outlook pst files into mbox format in few steps. After conversion, The resultant MBOX files can be imported into mbox clients such as Entourage, Thunderbird, PocoMail, Spicebird, Mulberry, Eurora, Netscape, SeaMonkey, OperaMail, ClawsMail, MozillaMail, Cone, Evolution, Sylpheed, Gnu Mail and Mutt email clients. Use it free demo version which enable the user to see the preview of convertible data and save 15 items per folder.
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Read more info: https://www.filesrecoverytools.com/pst-to-mbox-converter.html
You can also this this automated PST to MBOX Converter Tool, which can help you to easily and quickly convert all Outlook PST files to MBOX file format with all details and attachments without any data loss. It supports all MBOX based email clients like - Thunderbird, Apple Mail, Entourage, Eudora, SeaMonkey, and etc. For more info - https://www.cubexsoft.com/pst-to-mbox/
Easily convert all the Outlook PST files to MBOX format with the new PST converter tool, with this tool a user can convert Outlook PST files into MBOX format in just a few simple clicks. The tool is simple, easy to use, and converts the PST to MBOX in bulk quantity.
For more info:- http://www.howtomergepstfiles.com/convert/pst/
Everything is trouble-free and effortless through the assist of most responsible brand named as PST to MBOX Converter software. It has the potential to convert PST file into dissimilar other file formats such as MBOX, MSG, EML, and etc. The software shows the preview panel to the user before the migration process where they can systematically organize their data of PST. Refer:- http://www.pstfile.org/mbox/