See http://www.msoutlook.info/question/67

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Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
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> When I open emails the font is too small for the screen resolution that I
> am
> using. I've found ways to change most fonts to larger sizes but have been
> unsuccessful for reading email in outlook. Under view, fonts it defaults
> to
> medium. How can I change the default to large?