- Go to the Windows taskbar and select Start.
- Select Settings (the gear icon).
- In the Windows Settings dialog box, go to the Find a setting text box and enter Default.
- Select Default app settings.
- Looking for default app settings in Windows 10.
- Select Mail to display a list of email apps that are installed on your computer.
- Select Outlook.
- Selecting a default email client in Windows 10.
- Close the Settings dialog box.