I didn’t have access to an Exchange server to view them nor did I have access to an admin box that had it installed. All I had was Active Directory Users and Computers. With that I knew that I could queries within AD to see this info. The only hard part was finding out what I need to query for to find hidden mailboxes. After seconds of thinking…okay so more like hours but seemed like days I figured it out. Below are the steps that will find that data for you.
1. Bring up Active Directory Users & Computers.
2. Right-click your domain name at the top, and choose Find.
3. In the Find combo box at the top, select Custom Search.
4. Click the Advanced tab.
5. Paste in the following LDAP query:
(&(objectclass=user)(msExchHideFromAddressLists=TRUE))
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