See http://support.microsoft.com/kb/171440

>
>I don't know Sergey. Both machines - the one that sends it OK and the one that doesn't use Windows XP.
>
>How can I tell the version?
>
>A machine using Windows 7 sends it OK as well.
>
>We found out yesterday that it's not the sending machine that's the issue, it's the receiving machine. When he sends the email to his email address there is not text in the body. When he sends it to mine there is text in the body.
>
>His email goes thru Exchange, mine doesn't. I found some references to conflicts between Exchange and CDO mail, but none refer to body text. His version of Exchange seems to dislike something CDO does with body text.
>
>Does anyone have any experience with Exchange reading CDO mail issues?