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How to Fix Equipment Resource Mailbox Missing from Outlook Address Book
Question details
Users are unable to locate newly created equipment resource mailboxes within the Outlook Address Book or Scheduling Assistant.
- Product
- Microsoft Exchange / Outlook
- Device & OS
- not provided
- Scenario
- A user is attempting to schedule company resources, such as vehicles, using the Outlook Scheduling Assistant but cannot find them.
- Observed behavior
- While room mailboxes appear normally in the Scheduling Assistant, equipment resource mailboxes created in the Exchange admin center are completely hidden from the address book.
Ensure you have access to the Exchange admin center with administrator credentials or possess the necessary administrative privileges to run Exchange PowerShell commands.
Unhide the Equipment Mailbox via Exchange Admin Center
Use the Exchange admin center to verify and disable the setting that hides the equipment mailbox from the Global Address List.
Often, equipment mailboxes are inadvertently set to be hidden from address lists during creation. Modifying this setting in the admin center is the most straightforward way to resolve the visibility issue.
Log in to the Exchange admin center using your administrator credentials.
In the left-hand navigation pane, click on 'Recipients' and then select 'Resources'.
Locate and select the specific equipment mailbox (such as the company vehicle) that is missing from the address book.
Open the mailbox properties and ensure that the option to hide the mailbox from the Global Address List (GAL) is unchecked or disabled, then save your changes.
Update Mailbox Visibility Using PowerShell
Administrators can quickly unhide the mailbox from the address list using a direct PowerShell command.
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Frequently Asked Questions
Why do room mailboxes appear but equipment mailboxes do not?
Room mailboxes are typically created with default visibility enabled, whereas equipment mailboxes might have been inadvertently configured to be hidden from the Global Address List during their initial setup in the Exchange admin center.
How long does it take for the Outlook Address Book to update after making this change?
After you disable the option to hide the mailbox in the Exchange admin center or via PowerShell, it generally takes up to an hour for the Global Address List (GAL) to fully synchronize with all Outlook clients.
Can I still book the equipment if it is hidden from the address book?
If you know the exact email address of the equipment mailbox, you can manually type it into the attendee field. However, it will not be easily searchable or visible in the Scheduling Assistant until the hidden attribute is disabled.
