Recently I have been in a situation where I have Exchange 2016 Hybrid Exchange Online. Exchange 2016 Active Directory DS is synched to Azure Active Directory using Azure Active Directory Connect Apps.
I am looking for the best way to convert the Regular licensed mailbox (Size less than 50 GB) into a shared mailbox without a license.
As far as I know, a Shared mailbox of less than 50 GB do not required any license assigned, but when I convert the mailbox from the Microsoft 365 portal and cancel the license, the mailbox is gone missing.
The same happened when I used PowerShell or Microsoft Graph to convert the Regular mailbox to Shared Mailbox using the Set-Mailbox firstname.lastname@example.org -Type Shared cmdlet and then cancel the license. It goes deleted.
After lots of googling, I found the below solution.
First, Set the remote mailbox to shared On-premises with Set-RemoteMailbox.
Set-RemoteMailbox <user> -Type Shared
Let it sync, and verify the Microsoft 365 mailbox is shared as well.
get-mailbox <user> |FL *type*
If it’s not set to shared, then it first needs to convert to a shared mailbox, confirm its set and then remove the license.
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