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For Windows 10/11 (Using Outlook Desktop App)

  1. Open Settings
    → Press Windows + I or go to Start > Settings
  2. Go to Apps
    → Click “Apps” then “Default apps”
  3. Set Default Email App
    • Scroll to “Email”
    • Click the current default (probably “Mail” or “Google Chrome” if Gmail is set)
    • Choose Outlook from the list

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For macOS

  1. Open the Mail app (the built-in Apple Mail, not Outlook)
  2. Go to Mail > Settings (or Preferences) from the top menu
  3. In the General tab, find “Default email reader”
  4. Choose Microsoft Outlook from the dropdown

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For Web-Based Email (e.g., Gmail in Chrome)

If Gmail is opening when you click mailto: links in a browser like Chrome, you need to change the handler:

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In Google Chrome:

  1. Open Outlook Web App (https://outlook.office.com)
  2. Click the lock 🔒 icon next to the address bar
  3. Go to Site Settings
  4. Find “Handlers” and make sure it’s Allowed
  5. Now open Gmail, click the handler icon 🔧 in the address bar (if it shows), and disable Gmail as default

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If Using Outlook Web (and want it as default)

Browsers don’t support Outlook Web as the default handler by default, but you can use an extension:

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Use Chrome Extension:

  • Add “Mailto: for Outlook” or “Outlook Mailto Handler” from Chrome Web Store
  • This will route mailto: links to Outlook Web