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.