“Hide From Exchange Address Lists”

I have around 200 mailboxes all the users are in there own OU in AD. I need to hide them from the Global Address list in Exchange 2003. I know I can go into each user and check Hide from Exchange address lists but that would take a while. Anyone know how to create a batch file that would do this for me? Again all the users are in there own OU and all there mailboxes are in there own storage group.