Please note: The following steps will work for Microsoft Outlook 2013 or 2016.
Choose Open & Export > Import/Export.
Choose Export to a file.
Choose Comma Separated Values.
In the Select folder to export from the box, scroll to the top if needed and select the Contacts folder that's under your account. Choose Next.
Choose Browse, name your file, and choose OK.
Confirm where your new contacts file will be saved on your computer, and choose Next.
Choose Finish to start exporting your contacts immediately. Outlook doesn't display any message when the export process is complete but the Import and Export Progress box goes away.
Check out this third-party video for visual instructions