Licensed Shared mailboxes

You’re managing Office 365 for a company. You start seeing those licenses count down and you don’t know where they are going. Then it’s time to check if you have “Shared mailboxes” that are licensed!

The problem here is that sometimes user mailboxes are converted to a shared mailbox. Maybe it’s an employee that left but you still want to access the mailbox, or maybe the mailbox was accidentally created as a user mailbox to begin with. And Microsoft even has a button in Exchange Online for converting to Shared mailboxes! But the problem is that button does indeed convert it – but it’s not deactivating the license! This is probably working as intended as deactivating the license has some other affects like legal hold and other services.

This little command will list the mailboxes that are tagged as Shared mailboxes and lookup if their Azure AD object is licensed or not. It requires you to already have a remote PS session with Exchange Online as well as a connecting to MSOL service:

Then you may want to write something like this to automatically remove the licenses. Change “yourlicenseplan” to.. well, your license plan 🙂

Credit goes to Mohammed Wasay (

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