Exchange 2019: Create a Room mailbox using the Exchange Management Shell
Quick Tip:
If you want to create a room mailbox, you can do so with a simple command:
New-Mailbox -Name MyRoom -DisplayName "My Room" -Room
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To Validate your setup, you can run the following command:
>Get-Mailbox myroom | fl Name,RecipientTypeDetails
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There you have it, simple enough.