Also, Android version is 2.3.3, on a Galaxy S II .

Matt, the default mail app is giving us problems, meaning that email is synched correctly, but calendar items are not being replicated to the terminal. Also, I am reading confusing information on line: it seems that besides having this limitation, it does not allow you to respond to appointment invitations.
So, I was wondering what to do to allow full Exchange synch. Or, at least, mail AND calendar.