Changing the Default Font in Microsoft Word
http://word.tips.net/Pages/T001559_Changing_the_Default_Font.html

Wyatt, Allen
Word Tips
2009

Abstract:

Don't like the font that Word uses for a default in your new documents? You can pick a different font, but the way you make the selection is not as straightforward as you might expect. (This tip works with Microsoft Word 2000, Word 2002, Word 2003, and Word 2007.)