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Disable-UMMailbox

Use the Disable-UMMailbox cmdlet to disable Unified Messaging (UM) for UM-enabled mailboxes. Exchange PowerShell reference

From the Exchange PowerShell reference 6 parameters Its page in the reference

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Parameters

6 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the mailbox that you want to disable for Unified Messaging.
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.
-IgnoreDefaultScopeThe IgnoreDefaultScope switch tells the command to ignore the default recipient scope setting for the Exchange PowerShell session, and to use the entire forest as the scope.
-KeepPropertiesThe KeepProperties parameter specifies whether to keep or remove the UM properties for the mailbox.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.