Enable users to view calendar information of Room mailboxes

On Exchange Online Room mailboxes do not share calendar information by default. You will only be able to see if the Room is busy or not. This blog describe how you enable the Room’s calendar to show more information to all users.


First we need to connect to Exchange Online with PowerShell. If you don’t know how to connect, please read this blog post (https://blog.ctglobalservices.com/bfa/managing-office-365-with-powershell/).

Start setting the Room calendar to show more details by default, to do so type in this PowerShell command.

Now we are able to see more information.


To enable Room calendar to show subject of the meetings, please use this PowerShell command.

Now we are able to see subjects, however this will only works on new meetings or if you update an existing meeting in the calendar.



By | 2011-10-26T12:56:47+00:00 October 26th, 2011|Office 365|17 Comments

About the Author:

Brian Fahrenholtz


  1. Matt May 21, 2013 at 4:38 - Reply

    Thanks for sharing this Brian, its really helped me out when configuring our org’s room mailboxes.
    The change helps staff members identify who has booked the room and for what purpose.

  2. John August 22, 2013 at 22:35 - Reply

    Thanks so much, this was helpful!

  3. Kristian January 8, 2014 at 1:40 - Reply

    I have a conundrum here, how do I reset this?

    I have tried Set-CalendarProcessing -Identity Meetingroom -AddOrganizerToSubject $false -DeleteComments $true -DeleteSubject $true but the new meetings I book still shows the subject of the meeting. I would like to revert it to only show the name of the person booking the room/meeting.

    Best regards

    • Brian Fahrenholtz
      Brian Fahrenholtz January 20, 2014 at 13:01 - Reply

      Change -AddOrganizerToSubject $false to -AddOrganizerToSubject $true

      Set-CalendarProcessing -Identity Meetingroom -AddOrganizerToSubject $true -DeleteComments $false -DeleteSubject $true

  4. Deon July 17, 2014 at 4:39 - Reply


    I have executed these commands, however when I go and schedule a meeting I can still only see that a room mailbox is ‘busy’ it doe snot display a subject nor person whom have made the booking?

    Please help…???

  5. Christopher Espinel January 21, 2015 at 22:14 - Reply

    Is there any option that allows to add the shared calendar to all users automatically?

  6. Ruben May 12, 2015 at 20:56 - Reply

    I have a resource online that certain users are set to be delegates with Full Access permission, but for some reason, when they try to access that calendar in Outlook, it tells them “Cannot open calendar for user.” Why is that? Thanks in advance.

  7. Evan Camilleri August 5, 2015 at 13:23 - Reply

    I have executed these commands and they worked. Then i started getting ‘busy’ again. I tried to reset them but still same results ūüôĀ


  8. Abhishek December 16, 2015 at 4:09 - Reply

    Nice , worked fine. Thanks a lot

  9. joe March 10, 2016 at 8:17 - Reply

    Tried but subject still showing name of organizer’s
    Get-CalendarProcessing -Identity MR | FL

    Showing the AddOrganizerToSubject already $false

  10. Andy March 29, 2016 at 14:18 - Reply

    How do I show the room calendar? I want all my users to be able to see what is scheduled for the room in a month view? Anyone know how to do this?

  11. Wayne June 15, 2016 at 21:32 - Reply

    Why not just set the access rights to “Reviewer” and not using the second line of code at all?

    Set-MailboxFolderPermission -Identity ROOM@DOMAIN.COM:calendar -User default -AccessRights Reviewer

  12. Aaron Thorn December 22, 2016 at 18:36 - Reply

    Can i set a room calendar to show just the organizer information and nothing else ? If so how

  13. MrCalvin April 11, 2017 at 16:13 - Reply

    Another way without coding:
    1: create an email enabled security group (create it in O365 portal or in Exchange admin portal)
    2: Add employees to the group
    2: Add the group to the Meeting room as owner in Exchange admin portal “mailbox delegation”.

  14. Pankaj May 15, 2017 at 16:41 - Reply

    thanks for the wonderful solution, struggling from last 30 days for this. Thanks a lot and much appreciated.

  15. ssss October 17, 2017 at 12:42 - Reply

    i need that do only for one user that is able to see more details. other will se default

  16. Igor May 1, 2018 at 2:03 - Reply

    Open OWA
    Login with 365 Admin ID and password.
    Click the Calendar icon.
    Click the picture icon/avatar and choose Open another mailbox
    Type the resource name (e.g., S074BFR) and click Open
    Switch to Cal view
    Right click on the resource calendar
    Choose Permissions
    A list of users with permissions to the calendar are displayed.
    Make your changes and click Save.

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