In our Access.mdb we maintain our contact information. We sync this data with a VBA-program to an internal MySql-DB. For this dubbing process we have an elaborated algorithm which takes care of all details. In the end the MySql-DB contains for each contact the information 1=DoNothing (most of the contacts), 2=ExchangeCompleteContactInformation, 3=DeleteContact, 4=AddNewContact. With this approach we can keep the vast traffic on our desktop-pc (there goes all the dubbing calculation) and minimize the dubbing traffic between the google contacts and our mobiles since only a few contacts actually change each time.