Anyone running an Exchange server might want to take note of it's latest flaw. "[...] a person can gain unauthorized access to another users account."
What makes this even funnier to me is that not that long ago I read someone comment on a blog somewhere (might have been on scoble) saying that exchange was "invaluable" to them. People run exchange on purpose? Why? Anyway, I resisted responding at the time. Guess this is a good response though :)