There is an issue with the replies. At least for me, no matter what email system the mail was received on, when you reply it replies using the "default" message system as setup in Options >Advanced Options >Message Services. If I set my default up to be Desktop (BES) then it always replies using Desktop. If I change it to my Gmail then it always replies using GMail. It does this even if replying to a PIN message. If I try and send I usually get a red X because the reply can't find an original message (unless the message was received from my default message account.) Hope that makes sense.