Tools, options, mail format, stationery and fonts, themes. You'll need to
have an html file with a pink background in the stationery folder so you can
select it. In vista this folder is at
C:\Users\username\AppData\Roaming\Microsoft\Stationery
In Outlook 2007, you can click the "options" tab and click "page color" to
choose the background color of the message box. Note: If "page color" is
grayed out, position your cursor in the message portion of the screen.