I am just migrating to GW8 and trying to set the default mailing address for a contact programatically using AddressBookEntry object from VB code using
C3Po ClientState and related properties. I am using IGWAccount9 object and creating a new addressbookentry object using the AddressBookEntries.Add object. To this new object, i set a value to the DefaultMailingAddress Property. I am not thrown an exception but the value does not get set also.

Thanks in advace for your help.