Anyone any ideas on how I can migrate my email from the Mac (.olm) to Office 365?
Thanks
First export OLM files to PST, then import those PST to Office 365. Below links help you:
http://expert-advice.org/microsoft-outlook/manually-convert-olm-file-pst-format-olm-pst-conversion/
http://expert-advice.org/office365/migrate-mdaemon-office-365/
Did you manage to get this resolved?