How to Convert Mac OLM Files to EML?

1. Find a 3rd party App that can do the conversion.
2. Use the app to convert the files.

There is no Mac native process by which to convert OML files to EML.

https://www.systoolsgroup.com/blog/best-method-to-convert-olm-to-eml-with-attachments/

You can complete the converting process of Mac OLM files to EML in multiple ways. But the safest way to accomplish this is to use an expert tool rather than a manual/old technique.

To know more; https://apps.microsoft.com/detail/xp8c7bh85j8c16?hl=en-US&gl=US