Viewing hidden mailboxes in Exchange 2003

Michael mailed me with another question:

I did the e2k3 course last week and we couldn’t find the box that shows hidden mailboxes/distribution list. How do you do this? Do you have to write your own ldap query?

Well it’s not as easy as it used to be in Exchange 5.5 when you clicked on View-hidden recipients (we were really spoilt with this option).  In Exchange 2003 you need to run the following query against the GAL in Active Directory users and Computers.
1. Open Active Directory Users & Computers.
2. Right-click the domain name, choose Find.
3. In the Find dialog, select Custom Search.
4. Click the Advanced tab.
5. Paste in the following LDAP query
(&(objectclass=user)(msExchHideFromAddressLists=TRUE))
6. Click Find Now.
This will display the hidden mailboxes.

Come on Exchange Team – can’t we have a nice GUI feature like before?  I’m getting lazy in my old age…