Launch Outlook on your PC, click on the File tab, and select Info from the left sidebar. You can do this from within Outlook the following steps will walk you through the procedure: Some of the scenarios where you'd want to use this export method include when you're moving from one PC to another, switching from Windows to Mac, moving emails from one account to another, or just making a regular backup of your emails.
You can then use this PST file on another computer to import all your emails into Outlook. This format includes not only your emails, but your contacts and calendar as well. If you use Outlook on a Windows computer, you can export your emails to PST format. How to Export Emails From Outlook on Windows
We'll show you which one to use, depending on how you plan to use the exported emails (including working with them outside of Outlook). Outlook allows you to export your messages in various formats. If you're resetting your computer, changing your email app, or just playing around with something that could affect your emails, you may want to make a backup of your Microsoft Outlook emails through exporting them.