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1. Open Outlook Settings
- Launch the Outlook application on your desktop or web.
- In the upper-right corner, click on the settings (gear icon).
- Navigate to Mail on the left-hand side.
- Select Compose and reply from the options.
2. Customize the Default Font Settings
- Under the Message format section:
- Locate the Default font options
- Set the Font size to 11.
- click the Save button at the bottom of the page.
- Close and reopen outlook, compose a new email to confirm the default font size is applied.