There is another option available for the migration of the data from OLM to PST format on the Macintosh system which have very advanced features and have user friendly interface. To export he data you make use of vMail OLM to PST converter for Mac OS which have the high accurate rate of transferring the data quickly and safely without no error. This tool is one of the most suitable programs for this conversion.
Start the Outlook on MAC and choose the items.
Right Click on the folder, choose Move >> Copy to Folder.
Find your IMAP folder and select Copy.
Now update IMAP folder with Send/Recieve button which moves your OLM Emails to IMAP format.