If you mean that you've turned on the option to read all incoming mail as
Plain Text, see if reversing the steps shown here help:
http://support.microsoft.com/kb/831607
Otherwise you can't really change the format of incoming mail. If it's Plain
Text, you really can't change it to HTML
"Suzyq" <(E-Mail Removed)> wrote in message
news:B2F80126-7B60-4D51-9DDB-(E-Mail Removed)...
> I am using Outlook 2003. How do I change the format of new in-coming
> messages from plain text back to the default HTML