if you put your nav cd/dvd in your pc drive you will se some folders in root of the cd directory open TPD folder and there you will se some more folders, one of them will have date stamp 2007-1 should have ben dated in late 2006 probably 2006-08, 2007-2 is dated in early 2007 and so on
The image attached is from eu 2008-1

Attached Images

 

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X5 4,4i-06 Current
330Ci Cab-03 2007-2008
MB E55 AMG-03 2006-2007
Z3 2,8 Roadster-98 2006-2007
X3 2,0d-05 2005-2006
320d-99 1999-2005