Now let me tell you, I loath this dialog as much as the next guy, however, I just discovered something appalling today.
Palm (the makers of the PDA etc) ship this application called Pocket Mirror (I think its third party?) that synchronizes Outlook with Palm handhelds like my wife’s Treo 600. I was shocked today when I watched as the dialog appeared and disappeared on my wife’s laptop. Yes, they are programmatically dismissing this dialog themselves. Rather than sign their code, or use Extended MAPI or bother to consult MSDN, they just decided, we’ll decide for the user. Nice.