If you want to convert OLM file into Office 365, I would recommend Mac OLM to PST Converter for convert OLM file into Outlook PST format, the software come with many advanced features and It provides a single and batch conversions. You can preview of OLM file before the conversion, and then you can easily move your Outlook PST file in Office 365.Gives you the option to convert the mail with attachment. Such as email, draft, calendar, journals. This software is embedded with all the latest feature which make the import reliable and safe.
For more information: https://www.kdetools.com/olm/office-365/
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