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Disable-MailboxQuarantine

Use the Disable-MailboxQuarantine cmdlet to release quarantined mailboxes. Exchange PowerShell reference

From the Exchange PowerShell reference 9 parameters Its page in the reference

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Parameters

9 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the mailbox that you want to release from quarantine.
-DatabaseThe Database parameter specifies the database that contains the mailboxes you want to release from quarantine.
-IncludeAllDatabasesThe IncludeAllDatabases switch specifies that you want to release all quarantined mailboxes in all databases on the server you specify with the Server parameter.
-IncludeAllMailboxesThe IncludeAllMailboxes switch specifies that you want to release all mailboxes from quarantine in the database you specify with the Database parameter.
-ServerThe Server parameter specifies the server that contains the mailboxes that you want to release from quarantine by using the IncludeAllDatabases switch.
-StoreMailboxIdentityThe StoreMailboxIdentity parameter specifies the mailbox that you want to release from quarantine when you use the Database parameter.
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-IncludePassiveThe IncludePassive switch specifies that you also want to release inactive copies of the mailbox from quarantine.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.