Event invitations sent from other people's Google calendar to my German GMX inbox: this still does not work! Google does not let my add my German GMX e-mail address as an alternate address in my account (only a red border around email input with no error text whatsoever) and any invitations to GMX end in your 404 robot page. Seriously, Google?! Seriously, GMX?! But you both have so many customers, why care about details anymore...