- After logging into outlook.office.com, find the settings cog in the top-right, just next to your profile icon.
- Select “View all outlook settings” at the bottom of the side window.
- On the new window that has appeared, select the “Mail” tab on the left. Then navigate to “Compose and reply” just to the right of that.
- Find the Message format section and select the font and font size from the menu buttons.

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