I am trying to make a metro app which involves the user sending out an invitation email to friends. To do this, I am using the mailto:// protocol. However, if I try to include HTML tags in the body section, the Mail app reads them literally and displays raw HTML to the user. Is there any way to get around this?
All help is greatly appreciated and I always accept an answer!
I'm currently hunting for an answer to a similar problem, only in my case I also want to embed an image in the body of the email. I have not dug into the code much, but it seems like the Mail app does not handle all the protocols required to attach additional files to the html body. For the simple case though - you should be able to share your html being the share source and invoking the share charm. You are not limiting the user from using other applications as share targets for your html and you probably can't define the subject or recipients, but it's the best I could find.
There is a sample you can check here: "Sharing content source app sample".