This problem appears intermittent and can't (as far as I know) be replicated.
Sometimes, when forwarding a message (html) internally between Outlook 2003 clients, the text added to the forwarded message is hidden. If one saves the message to an HTML file and looks at it in Notepad, one can see a 'display:none' in the tags of the hidden text. Word is being used as the e-mail editor which is probably where the issue lies.
Anybody got any ideas as to why Outlook/Word is inserting this into the HTML, and is there a way to get it to stop?
I've seen a few references to this when using Google, so others are suffering it, but never an answer.