If you want to convert OLM file to MSGformat on Mac can be difficult because Outlook for Mac primarily uses OLM, while MSG is an individual message format. A practical way to handle this conversion is to use an OLM converter that supports MSG as an output option.

One option is MacSonik OLM Converter for mac. It can open OLM files directly on Mac without requiring Outlook for Mac. To convert the data, install and launch the tool, select the OLM file, and preview the mailbox folders and emails. Next, choose MSG from the available export formats, apply filters or attachment settings if required, select a destination folder, and start the export process. The software supports emails and attachments while retaining important email properties and folder hierarchy. It also allows multiple OLM files to be processed in a batch.

This approach is useful when you need individual MSG files from an Outlook for Mac OLM archive for Windows Outlook or further email management.