In previous versions of Windows Mail, I have been able to set the preferences so that messages would be deleted from my email server (in this case, EarthLink) when they were downloaded into Windows. I'm probably missing something obvious here, but I can't find a way to do that in Windows Live Mail.  As it is now, the messages are downloaded but remain on the server until I go into the server's site and manually delete them.  How do I set Windows Live Mail to delete messages from the server?