How do I find all my hidden mailboxes within my Exchange Orginization?
1. Open the MessageStats reports website.
2. Navigate to the Inventory | Mailboxes Report and Apply Filters
3. You will see a Default Field that says “Hidden" and it will have a Yes or no. You can then Right click on that Field and Select Sort by Descending and it will give you all the Hidden Mailboxes from the Top of the list to the bottom.
