Version applicability: Outlook and Excel 2019, 2016 Office 265 Windows and MAC OS Last updated: September 2018 Once a year, i typically consolidate a full list of all my Outlook contacts – both business and personal into a spreadsheet which i keep in a separate network storage. Use the Export-Mailbox shell cmdlet from Microsoft Exchange PowerShell to export mailbox data to an Outlook data (.pst) file. You cannot import an Outlook for Mac.olm file into Outlook for Windows. Outlook for Mac uses.olm files to store data, such as email and contacts.