of the Exchange Server say about this?
My guess is a setting, especially if the reinstall didn't work. Try deleting and recreating the Windows account to see what happens; this deletes and recreates all your personal settings also.
I have windows XP Pro and office 2003. Without any reason I can think of my Outlook e-mails have been converted to plain text. All of the settings are set for conversion to HTML and the box is unchecked that instructs conversion to plain text. I receive the mail through an Exchange server but using a different computer they come in HTML. Once converted to plain text, they stay that way even when viewed by web mail. I even tried reinstalling Office. Any suggestions would be appreciated.