Forum Discussion
Shared Mailbox can have a password and login enabled without license
This "feature" has been around for years, but despite probing Microsoft numerous times about it, we haven't received a clear answer. Until we do so, assume that it's unsupported, and that it breaks the license agreement.
Applications should still be able to access the mailbox via delegate/impersonation permissions.
Interesting. My approach usually is to create a "service account mailbox" (with license) to access shared mailboxes for applications.
Here is a passage from
https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits
Note
A shared mailbox is not designed for direct logon. The user account for the shared mailbox itself should stay in a Disabled (or "disconnected") state.
So while it might be technically possible, especially for applications you need to either license the mailbox or use a separate licensed mailbox for the shared mailbox access.
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