Outlook 2007 Trial - How to view some messages received as Plain Text

I am trying to find a way to set up Outlook 2007 so that only messages I am
expecting such as those in my Contacts List are automatically displayed in
HTML format and all Junk/Unexpected Possibly Dangereous Email is displayed as
Plain Text. Can I indicate the Read Format of Emails Sent by Contacts and a
different Read Format for Emails sent by Non-Contacts such as 3rd Party
Mailing Lists and other SPAM?

Thanks for any help you can provide.

Jim.