Use excellent Mac OLM to Office 365 converter software which perfectly convert OLM files to Office 365 account with all attachments and required items like contacts, calendar, emails etc. which can easily changes all OLM files data into PST format without any data loss. At the time of conversion, it removes all duplicate email data.
CubexSoft Mac OLM to Office 365 Converter is the most trustworthy and reliable solution to export Mac OLM file to Office 365 on Mac OS X. The tool is completely compatible with all editions of Mac OS such as 14 Sonoma, 13 Ventura, 12 Monterey, 11 Big Sur, 10.15 Catalina, 10.14 Mojave, 10.13 High Sierra, 10.12 Sierra, 10.11 EI Capitan, 10.10 Yosemite, and below versions. The software has many advanced features which allow users to perform the migration from OLM files to Office 365 on Mac OS in a couple of clicks. A user can also test the capability of the application that offers to convert the 25 items from each loaded folder without losing any information.
There are many ways possible to migrate OLM data to Office 365 cloud account but I suggest choosing a professional software OLM Converter. The application has many advanced features that users can easily use like batch conversion, message filtering, selective conversion, etc. It was workable on OLM and Windows OS including Windows 11. Refer: https://www.sametools.com/convert/olm/