Employee Handbooks are not Binding
Those employee handbooks are so pretty and well-written. When your boss said they were binding, you probably believed her. But, no, thoese handbooks are usually nothing more than a guideline. They are not at all binding, if the employer did its homework. See Russell Cawyer's post explaining how to be sure they are not binding. I have talked before about how these handbooks are almost always not binding.
But, of course, the trick the past few years has been how to make sure the overall handbook is not binding but make sure the arbitration clause *is* binding. Employers do love those arbitration clauses.