Convert a user mailbox to a shared mailbox

https://learn.microsoft.com/en-us/microsoft-365/admin/email/convert-user-mailbox-to-shared-mailbox?view=o365-worldwide

  1. Go to the Exchange admin center.
  2. Select Recipients > Mailboxes.
  3. Select the user mailbox. In the Others tab, select Convert to shared mailbox.
  4. If the mailbox is smaller than 50 GB, you can remove the license from the user, and stop paying for it. Don’t delete the user’s account. The shared mailbox needs it there as an anchor. If you are converting the mailbox of an employee that is leaving your organization, you should take additional steps to make sure that they cannot log in anymore. Please see Remove a former employee from Microsoft 365.

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