+For Exchange, if the user account is permanently deleted, Microsoft 365 Backup retains the inactive mailbox for the duration of the backup policy. To recover the inactive mailbox, follow the guidance at [Recover an inactive mailbox](/purview/recover-an-inactive-mailbox) to convert the inactive mailbox to a new, active mailbox. Once the inactive mailbox is recovered, add the new user to the backup policy to access backups from the recovered mailbox. The original, now deleted user can then be removed from the backup policy. Note that only the [Recover an inactive mailbox](/purview/recover-an-inactive-mailbox) process is supported. The [Restore an inactive mailbox](/purview/restore-an-inactive-mailbox) process will not preserve the backup data from the old mailbox.
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