Welcome to the forum,

The postcode search is a function of the map disc not the OS disc, the OS disc is for updating the navigation software, like when you went from win95 to windowsXP, it's just for rolling out fixes and new drivers etc.

If you want postcode search then get hold of the navteq 2008-1 map disc (CD) and it should have both TMC and Postcode search, the OEM map CD frrom BMW dos not have either, so that could be the problem.

HTH

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.