How to change email default font settings and theme in Outlook?
Outlook automatically applies its default font and theme settings when you create, reply to, or forward an email. If you find that the default styles don’t suit your preferences, Outlook allows you to customize these settings easily. In this tutorial, we’ll show you how to change your email’s default font settings and theme to better reflect your personal style.
Change email default font settings and theme in Outlook
Change email default font settings and theme in Outlook
1. Open Outlook and click "File" > "Options". See screenshot:

2. In the "Outlook Options" dialog, click "Mail" > "Stationery and Fonts".

3. In the "Signatures and Stationery" dialog, under the "Personal Stationery" section, click "Theme" or "Font" to choose your ideal style, and finally click the "OK" button to save these preferences and close the dialog.

4. Click "OK" again in the "Outlook Options" dialog to finalize your changes.
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