Use Coming Soon to preview upcoming changes to Outlook. Turn on the Try it now toggle to move Mail, Calendar, People, Tasks, and more from the bottom of your folder pane to the left side of the Outlook window.
You'll have quick access to Microsoft 365 apps like Org Explorer, and you'll be able to pin your favorite apps to customize your view.
To go back to the old view in Outlook or any other Microsoft 365 app, turn off the Try it now toggle for Coming Soon.