Incidentally from this little lot http://office.microsoft.com/en-gb/outlook-help/how-outlook-helps-to-protect-your-computer-from-viruses-HA001101870.aspx?CTT=1&or and a browse through the security settings I don't see how msgtag does it by using html to get your computer to download a picture: it looks to me as if that is blocked by the default security settings.