We know that in a hybrid scenario or during migration all shared mailboxes are migrated as a user account and then converted in a shared mailbox.
Sometimes admin forget to remove the license for the shared box after conversion and there is no GUI alternative to see if the shared mailbox is licensed. Shared mailbox in Office365 do not require a license.
To find out what shared mailboxes are “accidentally” licensed:
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#Connect to Office365 Import-Module MSOnline $O365Cred = Get-Credential $O365Session = New-PSSession –ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell -Credential $O365Cred -Authentication Basic -AllowRedirection Import-PSSession $O365Session #To view summary information about your current licensing plans and the available licenses for each plan Get-MsolAccountSku #Find out shared mailboxes that are licensed Get-Mailbox -ResultSize Unlimited -RecipientTypeDetails SharedMailbox | Get-MsolUser | Where-Object { $_.isLicensed -eq "TRUE" } #Find out shared mailboxes that are licensed and remove them #You need to supply your licensing plan name to remove licenses Get-Mailbox -ResultSize Unlimited -RecipientTypeDetails SharedMailbox | Get-MsolUser | Where-Object { $_.isLicensed -eq "TRUE" } | foreach {Set-MsolUserLicense -UserPrincipalName $_.UserPrincipalName -RemoveLicenses "yourlicenseplan:ENTERPRISEPACK"} |
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