The "testinguser" account has no New Messages
The "Mark" account has new Private Messages.
If you have private messages, you will get the classic mail flasher. If you dont have messages, you will get the standard envelope. Both will take you to your Private Messages when clicked on.
Previously, you would have to navigate through a menu of options to get to your Private Messages. Now the envelope is always displayed. But displayed differently according to if you have messages or not.