We just upgraded our domain controllers to Server 2012 R2. While everything seems to be functioning normally, a group that is denied any access to the Exchange GAL can now view and send to everyone. I've checked ADSI and the group is being denied everything. I've also checked user accounts to verify that they are in the group. Is it possible that a group that has permissions be trumping the deny? I have seen that Server 2012 handles things a bit differently coming from a 2003 domain. Any ideas on what the problem could be?
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