Black berry cannot reconnect when a mailbox is moved from one store to another on the same server. you have to move the mailbox to another server.
Also Blackberry synch only with new mails and the mails you move from a ps file are not new mails, but older imported mails.
If you activate a blackberry, it only synchronises a certain amount of items and items in the calendar get priority. So if the mailbox has a lot of appointments, not many mails in the inbox will be synchronised.