How to export Outlook folders Mac into PST file on Mac OS? Install the OLM to PST for Mac Tool through which a user can quickly export Outlook folders Mac into PST format on macOS. It doesn’t make any changes throughout the export Outlook folders Mac into PST process. This Mac OLM to PST Tool keeps all email elements and folder structure during the conversion or migration task. To get more info about the app, go with its free demo pack which allows you to export only 25 items without cost.