I logged a call with BMW about the email issue not showing up in iDrive.
I just got the following reply - they know about the issue and they are going to issue a new firmware to solve the problem.
We have now escalated the matter to Germany AG and Apple. BMW Technical could only get the BlackBerry device to sync with the idrive system and not iOS6. As per BMW Technical, a firmware needs to be developed for your vehicle to recognise MAP (MAP ACCESS PROFILE) to synchronise emails on your idrive system.
This case is currently logged on our system, I will report back to you next week on progress.
BMW (South Africa) (Pty) Ltd