Question : Update contact information in Exchange server global address book

I am looking to update address information in the Outlook Global Address book when this is changed in by Access application (2007 adp - using MSSQL 2005 database - Outlook 2007).

I need to:-
Find a reference field in the exchange file to link access contacts to the contact in Exch.
Update the contact
Get around the security message outlook seems to generate.

I would prefer to do this in access but am open to using vb.net to create a program to run on the server to update.

Appreciate any ideas on best way to approach it

I have had a look at some examples using MAPI but seem to allow for read only of contacts or creating a new one.

Answer : Update contact information in Exchange server global address book

even if one could edit the default GAL, i'm not keen on the idea.  i believe i'd follow MS's direction and create a GAL and modify that one.  in Exch 2007/2010, it must be done via the shell.  however, using the VBS in the link it might be easier to update a custom GAL than in the shell.

thoughts?