Microsoft 365 (macOS) Open Outlook: Once the app is installed, open Outlook from your Applications folder or Launchpad. Open System Preferences: Click the Apple icon in the top-left corner of your screen. Select System Preferences from the dropdown menu. Go to Internet Accounts: In the System Preferences window, click on Internet Accounts. This is where you manage email accounts and services like Google, Yahoo, Microsoft Exchange, and others. Add a New Account > Select Outlook or Exchange: Enter Your Outlook Email > Enter your Microsoft 365 email address > Enter Password Complete Setup: After selecting the apps to sync, click Done. Your Outlook (Microsoft 365) account is now added to macOS and will sync with the Mail, Contacts, and Calendar apps.