I couldn't change property BodyFormat of RDOMail object from plain text to html.
I have the following code:
RDOMail rdoMessage = rdoFolder.Items.Add("FooType");
rdoMessage.Subject = "Subject";
Also I'm adding some user properties here.
The next line of code not works properly. BodyFormat property stays equal to olFormatPlain(1), instead of olFormatHTML (2).
rdoMessage.BodyFormat = (int)rdoBodyFormat.olFormatHTML;