Or maybe the buttons I click shouldn't suddenly change without warning? This isn't a case of a user ignoring an important dialog box then wondering why their computer doesn't work anymore; the button just suddenly started to do something different, which is terrible user interface design.
To put it another way, how am I supposed to get anything done when I'm spending all my time making sure the interface doesn't change beneath my feet?
It replaced the Send And Archive button that lives next to Send. (Adding a new one is still a bad idea, imho, but would have been borderline forgivable)
