Hi Dimitry,
I saved the mail and I closed the composer window. If I go to Drafts folder and I reopen the mail, I still cannot see the image.

BUT... If I close the Outlook application, I reopen it and I go to Drafts and reopen the message that I saved, the image is displayed correctly.

Now, the question come: how can I do all those in code (c# or vb.net)