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Categories: Exchange

September 29, 2020

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Prevent/Fix: Shared mailboxes inaccessible due to license expired error

From Microsoft Corporation

MC222773, Prevent or Fix Issues, Published date: Sep 24, 2020

A change was made to Exchange Online to correct the way unlicensed mailbox access is handled. This change may cause Shared mailboxes to be inaccessible due to a license expired error.

Note: If you are not experiencing the following license expired error you can safely disregard this message

  • “The mailbox isn’t available. This may have occurred because the license for the mailbox has expired. To find out how to gain access to this mailbox again, contact the person who manages your email account.”

How this affects your organization:

This could cause delegates who are accessing shared mailboxes to no longer have access. This occurs because both On-Prem AD as well as Azure AD see the mailbox as Shared, but Exchange Online still sees the mailbox as a User mailbox.How you can resolve the issue:

If you are experiencing the error message that the license has expired and the mailbox is showing as a shared mailbox in both On-Prem AD and Azure AD but in Exchange Online it is not a shared mailbox, run the following cmdlet using Exchange Online PowerShell:

  • Set-Mailbox -Type Shared

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