To enable the new Outlook app on Windows 11, use these steps:

1. Open Outlook or Mail app on Windows 11.
2. Click the “Try the New Outlook” toggle switch.
3. Click the Next button.
4. 
5. Choose the “No, don’t send optional data” option.
6. Click the Accept button.
7. Click the Continue button.
8. Click the Open Outlook button.

Once you complete the steps, the Outlook experience will be available on Windows 11, whether you have the classic version of Outlook or the Mail and Calendar app.

The experience also includes a redesigned version of the Outlook calendar experience.

If you don’t see the “Try the New Outlook” toggle switch from the top-right corner, you may need to update your email client application to make the option available. If you have the Mail and Calendar app, open the “Library” section in the Microsoft Store app, and click the “Get updates” button.

In the case that you have the desktop version of Outlook, open the app > File > Office Account, open the “Update Options” menu, and choose the “Update Now” button.