Active Directory accounts (without email) are displaying in the Outlook Address book.

Hello,

I have an issue where accounts that are used for administration that do not have an Exchange email box are still being displayed in the Outlook address book.  I would appreciate any assistance to figure out why, and more importantly how to block this behavior.  Since these accounts are used for administration it would be best if they were not displayed anywhere outside of ADUC.  We are using AD 2008 R2, Exchange 2010 SP2 for email and unified messaging, Lync and Sharepoint.

Thanks

Steve

SteveH