Can anyone suggest a way to restrict access to the GAL? Anumber of users have got into the habit of selecting a vast number of recipients from the list and mailing them all...

Hello Steve, Which version of Exchange? There isn't any way to restrict the GAL for users, howeveryou can set maximum number of recipient so users can not send mails to bulk of recipients by selecting them all.

Hi 2007

Hello Steve, You can take a look at Address List Segregation session in this article... Configuring Virtual Organizations and Address List Segregation in Exchange 2007 http://technet.microsoft.com/en-us/exchange/bb936719.aspx