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.