Show Microsoft 365 Room Mailbox Meeting Details

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By default, Exchange Online only displays the availability status (free/busy) for room mailboxes. However, organizations often require more visibility—such as meeting organizer details, subject, and location—to efficiently manage shared spaces.

Learn more in the article below:

🔗 Microsoft 365 Room Mailbox Meeting Details

You Should Know:

PowerShell Commands to Customize Room Mailbox Visibility

To enhance room mailbox meeting details in Exchange Online, use the following PowerShell commands:

1. Connect to Exchange Online PowerShell:

Connect-ExchangeOnline -UserPrincipalName [email protected] -ShowProgress $true
  1. Enable Detailed Meeting Information for a Room Mailbox: 
    Set-CalendarProcessing -Identity "RoomMailboxName" -DeleteSubject $false -AddOrganizerToSubject $true

3. View Current Room Mailbox Settings:

Get-CalendarProcessing -Identity "RoomMailboxName" | Format-List

4. Bulk Update All Room Mailboxes:

Get-Mailbox -RecipientTypeDetails RoomMailbox | Set-CalendarProcessing -DeleteSubject $false -AddOrganizerToSubject $true

5. Disable Private Event Flag (if needed):

Set-CalendarProcessing -Identity "RoomMailboxName" -RemovePrivateProperty $false

Linux/Mac Alternative (via OAuth & REST API)

If managing from Linux/Mac, use `curl` with Microsoft Graph API: 

curl -X PATCH "https://graph.microsoft.com/v1.0/users/RoomMailboxID/calendar" \ 
-H "Authorization: Bearer $ACCESS_TOKEN" \ 
-H "Content-Type: application/json" \ 
-d '{"isRemovableOnPrivate": false, "defaultOnlineMeetingProvider": "teamsForBusiness"}'

What Undercode Say:

Managing room mailboxes efficiently requires proper PowerShell or API automation. Key takeaways:
– Always audit existing settings before modifying room mailboxes.
– Use `-WhatIf` in PowerShell for testing changes.
– For hybrid environments, sync changes via `Invoke-Command` to on-prem Exchange servers.
– Log all modifications for compliance: 

Start-Transcript -Path "C:\Logs\RoomMailboxChanges.log" -Append

Expected Output:

Identity : RoomMailboxName 
DeleteSubject : False 
AddOrganizerToSubject : True 
RemovePrivateProperty: False

Expected Output:

A fully configured room mailbox displaying meeting organizers, subjects, and locations in Outlook calendar views.

References:

Reported By: Alitajran Microsoft365 – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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