Migrated resource mailboxes not visible in All Rooms address book for people still on-premise

Question

We are in hybrid mode with Exchange 2016 and Exchange online. Most users have not yet been migrated. I migrated a conference room mailbox to Exchange online. From another mailbox in Exchange online I can click Add Rooms and the migrated room mailbox appears along with the others.
From Exchange when I click Add Rooms I only see the ones that are still on-prem and not the migrated one. However, if I look in the Global Address List instead of the All Room address list I do see that migrated room.

Is there a way to get the migrated room to show in the All Rooms list for people still on Exchange or do they have to go the GAL to select the migrated room?

Thanks

Answer 1

yep!

So now check your address list for all rooms:

Should look something like:

RecipientFilter : (Alias -ne $null -and (RecipientDisplayType -eq 'ConferenceRoomMailbox' -or RecipientDisplayType -eq
'SyncedConferenceRoomMailbox'))
LdapRecipientFilter : (&(mailNickname=*)(|(msExchRecipientDisplayType=7)(msExchRecipientDisplayType=-2147481850)))

msExchRecipientDisplayType=-2147481850
represents the RemoteRoomMailboxes
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_exchon-mso_o365b/recipient-type-values/7c2620e5-9870-48ba-b5c2-7772c739c651
If its not set to include those, add it!

Here is an example using "Equipment lists"
You can substitute the All Rooms List and use the recipient filter:

Set-AddressList -Identity "All Rooms" (Alias -ne $null -and (RecipientDisplayType -eq 'ConferenceRoomMailbox' -or RecipientDisplayType -eq 
SyncedConferenceRoomMailbox'))

https://social.technet.microsoft.com/Forums/en-US/311b527b-fc35-4eb6-881d-dece97b6a1c7/room-resource-mailboxes?forum=onlineservicesexchange

Answer 2

Checking on-prem via Exchange Powershell. What does it show?

get-mailbox <migrated MBX> |FL  RecipientTypeDetails, AddressListMembership

Answer 3

@Kenny Stern

We don't have to modify attributes msExchRecipientDisplayType and msExchRecipientTypeDetails, we just need to modify the filter for your "All Rooms" address list to include room mailboxes migrated to O365.

I made some modification on the command provided by AndyDavid, it should work on your Exchange server:

Set-AddressList -Identity "All Rooms" -RecipientFilter {(Alias -ne $null) -and ((RecipientDisplayType -eq 'ConferenceRoomMailbox') -or (RecipientDisplayType -eq 'SyncedConferenceRoomMailbox'))}  

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Answer 4

Hi there!

Equipment Mailboxes are not included by default in Exchange Online
https://learn.microsoft.com/en-us/exchange/address-books/address-lists/address-lists

All Rooms Address list Includes all room mailboxes. Equipment mailboxes aren't included.
You can add to the existing rooms list or create a new one for equip:

So something like
New-AddressList -Name "All Equipment" -RecipientFilter {((Alias -ne $null) -and (RecipientDisplayType -eq "EquipmentMailbox") -or (RecipientTypeDetails -eq "EquipmentMailbox"))}

However!!!! Note that special rules apply to Address Lists and Exchange Online:

1. You need to add the account to the Address Lists role before you can see these cmdlets in Exo
   https://learn.microsoft.com/en-us/powershell/module/exchange/new-addresslist?view=exchange-ps
2. Any existing equip mbxs wont be in that new or rooms address list. If so, you need to touch the accounts. see:
   https://support.microsoft.com/en-us/help/2955640/new-address-lists-that-you-create-in-exchange-online-don-t-contain-all

Personally, I don't add equipment mailboxes to the All Rooms list, but up to you! :)