Article ID: 2635223 - View products that this article applies to.
Consider the following scenario:
This issue occurs because the HiddenFromAddressListsValue property of the hidden user is not passed when the Exchange server generates the Active Directory session Read Recipient filter for Direct Report View and Distribution Group View.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2661854/ )Description of Update Rollup 2 for Exchange Server 2010 Service Pack 2
For more information about how to hide mailboxes from Address Lists in Exchange Server 2010, visit the following Microsoft website:
How to hide mailboxes from Address Lists in Exchange Server 2010