FRUSTRATION
It is REALLY ANNOYING when choosing messages to delete, clicking down, then accidentally clicking on a message instead of choosing it with the checkbox ...ALL THE MESSAGES I SELECTED ARE NULLED AND I HAVE TO RESELECT THEM ALL AGAIN. This causes me to click just a few messages, delete, then a few more, delete. COMPLETE WASTE OF TIME. If I am clicking message boxes RETAIN THE CHOICES IF I HAPPEN TO CLICK THE MESSAGE INSTEAD OF THE BOX.
3rd
ranked