Outlook Replies Changing to Text

Every time I get an email from my boss (and some others), it seems to be in HTML because it displays in Ariel or something like it. But when I Reply or Reply All, it switches to Plain Text and displays in Courier New. Since I don't want my emails to brand me as a Neanderthal, I change the email to HTML, Select All and change everything back to Ariel.

Windows XP didn't do this... any ideas?

By the way, it's Outlook 2003. In Tools|Options| Message Format HTML is my Compose in this message format.

Thanks!

Hal

Hi, did you ever get any reply? I have the same problem with Outlook 2007.
thanks,
Cindy