1. Click on the Apple icon in the top left of screen.
2a. Click System Preferences >General > Default web browser:
2b. Change Default web browser to Safari.
3. Go back to System Preferences then, go to Internet Accounts tab and add a Microsoft Exchange account:
4. Enter email and click Sign In:
5. At the pop up, select Sign In:
6. You'll be redirected to the Okta Sign-In page. Enter your email/password and accept the Duo prompt:
7. After logging in, select the apps you want to use with the account and select Done:
8. You should now see your Microsoft account and name in the Internet Accounts window:
9. Open the Mail app. At the top left corner, click Mail > Preferences > General:
10. The Default email reader should be set to Microsoft Outlook: