Best practice to create room mailbox in Exchange Hybrid setup

prabhash-jena 21 Reputation points
2021-04-29T10:22:18.627+00:00

Hi,

I am running Exchange Hybrid setup, Exchange 2019 with Exchange online. All our mailboxes (user\shared\room etc.) are migrated to Exchange online. All the users & room mailboxes has 'IsDirSynced' property value of 'TRUE'. AzureAD connect is in place for AD sync.
Now I want to cerate new Room Mailbox. Shall I create it in Exchange Online EAC directly or on On-prem Exchange ECP?
Anybody has some tips about what would be the best practice going forward to create Room\Shared mailbox?

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
4,189 questions
Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
1,895 questions
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  1. Andy David - MVP 142.2K Reputation points MVP
    2021-04-29T11:40:23.9+00:00

    Unless you have some reason you need to create the remote mailbox on-prem , then I would create directly in Exchange Online.

    However, if you want to manage the Properties of the room with on-prem EAC or powershell the same as the user maiboxes, create it on-prem.

    Its really up to you, there is no best practice.

    1 person found this answer helpful.

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  1. Stefan Rottler 1 Reputation point
    2021-04-29T11:15:20.51+00:00
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  2. Lucas Liu-MSFT 6,161 Reputation points
    2021-04-30T02:30:31.897+00:00

    Hi @prabhash-jena ,
    1.For the room mailbox. If you don't need to create a remote mailbox or manage it through On-premises Exchange management tools. You can create it directly in Exchange online. If needed, you could create it on-premises Exchange.

    2.For the shared mailbox, I recommend that you first create Shared mailbox in on-premises Exchange server. Because of this known issue I found below, if we create a shared mailbox directly in Exchange online, it will may cause the following problems.
    Please refer to: Users in a hybrid deployment can't access a shared mailbox that was created in Exchange Online

    1).Users can't open the shared mailbox in Outlook.
    2).Users can't view free/busy information for the shared mailbox.
    3).Users can't send mail to the shared mailbox.

    About remote mailbox, please refer to：Enable-RemoteMailbox
    92831-3.png

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