Hi kitsguy,
I have moved your post here, as this is the proper forum for it.
When e-mail is sent from Windows Live Hotmail, our servers automatically transmit it to your recipient's e-mail address. We currently do not have a feature that can recall sent messages even if the recipient does not yet open them. What I can do for you at the moment is to take note of your inquiry and bring it up with our Product Development Team as a feature request. They consider all customer comments and inquiries in the future releases of Windows Live Hotmail.