You can also try CubexSoft OLM Converter for Mac & Windows Tool to import Outlook OLM to MBOX Apple Mail without any problem. It is one of the best way to import Mac OLM files to PST, PDF, EML, MSG, CSV, ICS, IMAP, Thunderbird, Office 365, Gmail, and
more saving options. Also, the program provides so many advanced benefits like batch option, file naming option, destination location, free demo, separate PST per OLM, simple GUI, and so on.
For more details>>
https://www.cubexsoft.com/olm/
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