I've found notes on the forum about this, but they all go back to 2007. I have a domain here at wp.com (fleurdepains.ch) and am using Google Apps for e-mail. I'd like the web interface to be available at http://mail.fleurdepains.ch instead of http://google.com/a/fleurdepains.ch (way easier for non-tech people).
Is this still impossible?
If it is, consider this a feature request. Very important for people hosting business sites on wordpress.com.