Andrew - I have the same issue.
From my googling efforts I've seen there is potentially a method of utilising your Macbook pro (which I know you have) - by setting up the car as a bluetooth device and syncing your contacts that way.
Google "Mercedes, COMAND, contacts Macbook Pro" and you should find something useful. Please let me know how you get on.
Gone but not forgotten:
325i M Sport (E92), Black Sapphire, Coral Red Dakota, 19" 225's, Seat Heating, 6FL and de-badge
Replaced by 6.2 litres of AMG powered C class.