Step 1:
From the ‘File’ menu, select ‘Export.’
Step 2:
Select an ‘Outlook for Mac Data File (.olm)’ and then select what information you will export. Click ‘Next.’
Step 3:
Select ‘No, do not delete items’ and click the right arrow.
Step 4:
Choose the name and location for the new export file to be saved to. Click the ‘Save’ button.
Step 5:
Click ‘Done’ to complete export.