There is no native MS-Outlook app for Linux, but there is a chrome-based web app that has most of the functionality and acts (almost) like a normal desktop app.

To install this on your Linux system, you will need to use a chromium-based browser (e.g. Google Chrome, Brave browser) and go to: https://outlook.microsoft.com/

From this site, you can install the web app, following the same method we have outlined (with screenshots) for Teams.

At the moment, this same procedure can be followed to install Teams and OneDrive web apps as well.