When Domino Web Access (dwa 7 template on Domino 7.0.2) is configured as default mail client, after sending an email from for example Microsoft Office (using MAPI), Internet Explorer 7 pops up the following prompt:
Anyone know of a setting/workaround that prevents this prompt?
Not really. IE7’s security may be a bit overzealous, but that’s because previous versions would allow all kinds of unpleasant shenanigans. The problem here is that your code is trying to close the browser, not just the window it opened (or a pop-up window). There’s no real way to tell the browser “relax, dude, I opened you from another program” from inside the browser.