How to Change the Default Font and Size for New Emails in Microsoft Outlook

Maintaining brand compliance and readability across corporate correspondence starts with email typography. By default, Microsoft Outlook formats outgoing email bodies using 11-point Calibri or Aptos. If your organisation mandates a distinct typeface—such as Segoe UI, Arial, or Georgia—or if you require larger text sizing to improve legibility on high-resolution displays, manually altering the font every time you compose a message is inefficient and prone to oversight.

Microsoft Outlook resolves this through its centralized Stationery and Fonts settings. By setting global typography defaults, you can establish consistent font families, font weights, sizes, and font colours across all new outgoing messages, replies, and plain text viewports. This guide explains how to configure default fonts in the classic desktop version of Microsoft Outlook on Windows, the new Outlook interface, and Outlook on the web.

Setting the Default Font in Classic Outlook for Windows

The traditional Microsoft 365 and Office desktop client offers deep granular controls over composition, replying, and plain text rendering:

1. Launch the Microsoft Outlook desktop app.
2. Click the File tab in the upper-left corner of the ribbon.
3. Select Options at the bottom of the left-hand navigation pane.
4. In the Outlook Options window, click the Mail category on the left.
5. Under the Compose messages group, locate and click the Stationery and Fonts… button.
6. In the Signatures and Stationery dialogue, ensure the Personal Stationery tab is selected.
7. Under the New mail messages header, click the corresponding Font… button.
8. In the font selection window, customise the following parameters:
   • Font: Choose your desired typeface (e.g. Arial, Segoe UI, or Calibri).
   • Font style: Set to Regular (or Light/Semibold based on branding guidelines).
   • Size: Adjust to your preferred point size (e.g. 11 pt or 12 pt).
   • Font colour: Select a standard dark neutral, such as Automatic, black, or dark navy.
9. Click OK to confirm your selection.
10. Under the Replying or forwarding messages section, click the Font… button if you wish to configure distinct font sizing or custom text colours for message threads.
11. Click OK in the Signatures and Stationery dialogue, then click OK in the Outlook Options window to save your changes permanently.

Configuring Default Fonts in the New Outlook for Windows

If you are running the modern, streamlined “New Outlook for Windows” interface, typography settings sit within the simplified cloud-synced settings menu:

1. Open the New Outlook application.
2. Click the Settings gear icon located in the top-right corner of the window.
3. In the left sidebar of the settings panel, select Mail.
4. Click Compose and reply in the secondary column.
5. Scroll down to the Message format section.
6. Under the Compose messages in HTML format preview box, use the formatting toolbar to pick your preferred typeface from the font dropdown (e.g. Aptos, Calibri, Georgia).
7. Select your target point size (e.g. 12).
8. Optionally select text colour, bold styling, or paragraph line spacing.
9. Click the Save button at the bottom of the settings pane.

Configuring Default Typography in Outlook on the Web (OWA)

For users who access corporate email via modern web browsers, setting typography in Outlook Web App ensures consistency when working across laptops, tablets, or shared terminals:

1. Log in to your account at outlook.office.com.
2. Click the Settings gear icon in the top-right banner.
3. Navigate to Mail > Compose and reply.
4. Scroll down to the Message format options.
5. Adjust the font family and point size inside the preview editor.
6. Click Save to commit your changes across browser sessions.

Best Practices for Professional Email Typography

Typography Setting	Recommended Value	Business Justification
Font Family	Segoe UI, Arial, Calibri, Aptos	Universal system availability across Windows, macOS, iOS, and Android
Font Size	11 pt or 12 pt	Balances desktop readability with compact smartphone screen rendering
Font Colour	Automatic / Dark Charcoal (#222222)	Provides high contrast without the harshness of pure black text
Reply Distinctions	Slightly subdued blue or deep navy	Visually delineates your response from quoted conversation history

Troubleshooting Common Font Display Glitches

• Recipient sees Times New Roman instead of your custom font: If you select a proprietary or custom-licensed font that is not pre-installed on the recipient’s operating system, their local email client will substitute it with a default fallback (often Times New Roman). Stick to web-safe system typefaces for general correspondence.
• Fonts reset when pasting text: Pasting formatted text copied from websites or external documents carries source formatting. When pasting into Outlook, right-click and select Keep Text Only (or press Ctrl + Shift + V) to adopt your default font styles automatically.
• Stationery button is greyed out: In corporate enterprise environments, group policies (GPO) or Microsoft Intune administrative templates can lock typography configurations to ensure strict brand compliance. Contact your system administrator if these settings are disabled.