Professional Guide to save the OLM files to MBOX format on Mac device
Mac users prefer MS Outlook on their mac devices for email communication. But sometimes due to the storage problem or fewer features they want to migrate emails from Outlook for Mac to other email clients like Mozilla Thunderbird, Zimbra, Seamonkey, and Eudora. So, you must know one thing that all these email clients support MBOX files. Therefore converting Mac Outlook OLM to MBOX on Mac can bring you the solution to your problem. You can easily move all the emails with attachments from your Mac Outlook to Thunderbird, Zimbra, or Eudora with the help of an automated tool.
read more:- https://www.macsonik.com/blog/how-to-migrate-olm-to-mbox-mac/

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harber commented
To save the OLM files to MBOX format on Mac device, use the latest CubexSoft Mac OLM to MBOX Converter Tool. It is one of the amazing app which allows you to export bulk OLM files to MBOX files on macOS at once without losing any data. It keeps all email elements, folder layout and data hierarchy intact during the conversion task. One can effortlessly run this application on any Mac and Windows operating system with ease. Free demo is also available to check out the program functioning without paying any cost.
Visit here- https://www.cubexsoft.com/olm/mbox.html