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In the Font dialog box that opens, you have several options from which to choose. You can change Outlook’s default font, the style, the size, the color and even add effects such as Strikethrough or Underline. After you have made all of your desired choices, click OK.
Click the button to change the default font for forwards and replies. You can choose the same settings you chose for the new mail message default, or get a little crazy and use completely different options. When you are finished, click OK.
You can also choose to change the plain text email default font. One point to remember if you decide to change this font is that if you use a special font you installed, or if the recipient does not have that font installed, they will not be able to see the font you set.