If you are using Gmail that is supported through a labs feature: http://gmailblog.blogspot.com/2011/01/new-in-labs-unread-message-icon.html http://gmailblog.blo

If you are using Gmail that is supported through a labs feature: http://gmailblog.blogspot.com/2011/01/new-in-labs-unread-message-icon.html http://gmailblog.blogspot.com/2011/01/new-in-labs-unread-mes...