An Exchange Online room list isn't viewable in Outlook or OWA

Original KB number:   4039148

Problem

A room list in Microsoft Exchange Online cannot be viewed in Microsoft Outlook or Outlook Web App (OWA).

Cause

This issue occurs if the room list is reverted to a distribution group.

Solution

To resolve this issue, follow these steps:

1. Run the following cmdlet to verify the recipient type of the room list. If the recipient type is not displayed as RoomList, go to step 2.

   Get-distributionGroup "Name of the affected room list" | fl recipienttypedetails
   

2. If the tenant is a cloud-only tenant, run the following cmdlet in Exchange Online PowerShell:

   Set-DistributionGroup "Name of the affected group" -RoomList
   

3. If you have an on-premises deployment of Microsoft Exchange Server, run the cmdlet from step 2 in the on-premises Exchange Management Shell.

4. If you do not have an on-premises Exchange Server deployment, change the msExchRecipientTypeDetails attribute against the affected distribution groups, and set the value as 268435456 by using the Active Directory PowerShell Module. To do this, follow these steps:

   1. Start PowerShell as an administrator on any domain controller or any server that has a remote server administrator pack installed, and then run the following cmdlet to verify that the module exists on the server:

      Get-Module -ListAvailable activedirectory
      

   2. Import the Active Directory PowerShell Module by using the following cmdlet for PowerShell versions earlier than 3.0. (For PowerShell module 3.0 or later versions, the module should autoload based on the commands that are issued.)

      Import-Module activedirectory
      

   3. Run the following cmdlet to check the current value of the msExchRecipientTypeDetails attribute. If no result is retuned, the attribute has no set value.

      Get-ADObject -Filter {Name -eq "Name of the Distribution group"} -Properties * | Out-String -Stream | Select-String msExchRecipientTypeDetails
      

   4. If no value is set on the attribute, run the following cmdlet to set the value:

      Get-ADObject -Filter {Name -eq "Name of the Distribution group"} -Properties * | Set-ADObject -add @{msExchRecipientTypeDetails=268435456}
      

   5. If the attribute value is set incorrectly, run the following cmdlet to change the existing value:

      Get-ADObject -Filter {Name -eq "mailsg1"} -Properties * | Set-ADObject -Replace @{msExchRecipientTypeDetails=268435456}
      

More information

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