Am I allowed to give a 365 licence to a shared mailbox

I had this question after viewing Office 365 can I use portal to read mail in shared mailbox.

Am I allowed to give a licence to a shared mailbox?  Then I should be allowed to login to it?

Thanks Terry
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Vasil Michev (MVP)Commented:
You are, but it you are going to assign a license to the shared mailbox, why not simply convert it to regular user mailbox?

What is the issue you are trying to solve here? You can login to shared mailboxes as delegate (Full access permissions) and even configure them in Outlook as additional account. In most cases you should not need to access it directly.

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terrybuck9Author Commented:

Thanks for the reply.

The user wants to login to the shared mailbox so he can run Flow to update a spreadsheet from the items in one of the Shared mailboxes folders.  It's way beyond me, I am just trying to give him the setup he needs.

The shared mailbox is currently in use with about 20 users and lots of emails and folders, and several email addresses.  

I did not know I could convert the mailbox.  How do I do that?  and will the mailbox stay intact?  We are synced to in house active directory.

thanks Terry
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Vasil Michev (MVP)Commented:
I doubt Flow will be able to work correctly with Shared mailboxes even if you license it. Probably a case of unrealistic user expectations, but I guess doesnt hurt to try.

You can convert the mailbox to "regular" via PowerShell or via the Exchange Admin Center -> Recipients -> Shared -> select the mailbox in question and look for the Convert link on the right hand-side. Remember to license the corresponding user though! And no, nothing changes after that, you are basically "enabling" a username/password for the Shared mailbox. All content and permissions granted will remain intact.

If you have on-premises Exchange though, there might be a slight disconnect in how the converted mailbox will appear.
terrybuck9Author Commented:
Hi Vasil

Thanks again.  Should I licence the user first, before I convert?

thanks Terry
Obviously, it's always better to prevent a problem from happening in the first place (though I suspect running the command on an unlicensed mailbox might already stop it), so yes, assign license first.
terrybuck9Author Commented:
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