I don't known how config the GAL with exchange manager in exchange server 2007. I unallowed every mail-user can see other mail-users from Global Address List. And add a customer addresslist,thatmail-user of this address list can see other mail-users from this address list,and other address list's mail-user can't. Any help at all would be appreciated,other atricles for help. Echang

Your post is confusing. Have you since resolved this issue? What exactly did you do when you say: "I unallowed every mail-user can see other mail-users from Global Address List"For more detail, I'd encourage you to look at this article:Managing Global Address ListsAnd if you are somehow trying to convert your exchange server into a hosted style server, consider this 3 part series.