Change the default font for e-mail messages

1. On the Tools menu, click Options.
2. On the Mail Format tab, click Stationery and Fonts.
3. On the Personal Stationery tab, under New mail messages, click Font.
   
4. On the Font tab, under Font, click the font you want to use for all new messages.
5. If you want, select a font style and size.
   

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    Click the default font you want to use for all future messages.
    The font style can be left blank for a regular font, or click an item in the list.
    Enter the default font size.
    If you want to specify a default font color, click the color in the list.

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6. Click OK on the Fonts, the Signatures and Stationery, and the Options dialog boxes.

When you create a new message, the new settings will take effect.
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Change the default font style for messages that you reply to or forward

1. On the Tools menu, click Options.
2. On the Mail Format tab, click Stationery and Fonts.
3. On the Personal Stationery tab, under Replying or forwarding messages, click Font.
4. On the Font tab, change the font options to what you want to use for future messages.
   
5. Click OK on the Fonts, the Signatures and Stationery, and the Options dialog boxes.

When you reply to or forward a message, the new settings will take effect.
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Restore the default font style options

To restore the font to the default setting of 11-point Calibri, do the following:

1. On the Tools menu, click Options.
2. On the Mail Format tab, click Stationery and Fonts.
3. On the Personal Stationery tab, under New mail messages, click Font.
4. On the Font tab, under Font, click the entry +Body.
5. Under Font style, click Regular.
6. Under Size, click 11.
7. Click OK on the Fonts, the Signatures and Stationery, and the Options dialog boxes.

another suggestion

Ctrl key and simultaneously zoomed out using the mouse wheel. When font became samll enough to my liking, saved the message and closed it. It corrected the problem for other messages as well.