I have added besadmin as a user and asigned it a BB, all activated wirelessly fine (should prove not a network thing). I have logged into a PC as besadmin opened up outlook and attached the BES users mail box's and I am able to send e-amils as them (forward an existing mail with there name in the from field).
The etp.dat messages dont look like they are coming into the mailbox's now however. I have just added a user and set activation password (for one of the other user not besadmin) however I didnt not activate the BB. I then waited for the bb message to come in (it has been about 5 minutes and nothing has happened)