If you have the two software on the same computer, there is going to be a problem when you print HTML emails from Outlook.
The Outlook printout of mail sometimes will have no headers. For example, username, date and time, the subject will be missing. I checked the amount of text and it appears that IE 7 is trying to squeeze text into the page resulting in the truncation of the mail header.
Microsoft Partner support recommends to uninstall IE7 and revert back to IE6.