How to Convert Outlook Email to MBOX
Is there a way to convert Outlook e-mails to MBOX format? The eSoftTools PST to MBOX converter software converts Outlook emails and folders into MBOX files and folders, preserving all of their metadata. With a few mouse clicks, Outlook emails can be converted to mbox format. Before converting your Outlook emails, calendars, and contacts, preview them in your mbox. This capability is provided to preserve email attributes and perform advanced data filtering while converting emails, calendars, and contacts. In the free trial version offered to all users, only 25 things can be altered at a time.
Get more info:- https://www.esofttools.com/pst-to-mbox-converter.html

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Jacksonallen commented
Manually exporting Outlook mailbox to MBOX is a typical task. However, with the Advik Outlook PST Converter, you can do it in just a few simple clicks. With this utility, you can export emails from Outlook to MBOX in batch. It preserves data integrity and mailbox folder hierarchy during the conversion. The interface of this utility is very simple and easy to use. Both technical and non-technical users can easily use it.
Read More: https://www.adviksoft.com/blog/how-to-export-mbox-from-outlook-application-with-attachments/