Hard to say without any configuration information.
Does Outlook display an Info Bar above of the message, indicating it has
converted the message for you?

--
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
Outlook FAQ, HowTo, Downloads, Add-Ins and more

http://www.msoutlook.info/
Real World Questions, Real World Answers

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"kr" wrote in message
...
All of my incoming e-mails are coming in plain text format, even from
people
that send in html. How can I stop this automatic conversion?