CmdID

CmdID / PowerShell / Cmdlets / Set

Set-SystemMessage

Use the Set-SystemMessage cmdlet to modify custom system messages. Exchange PowerShell reference

From the Exchange PowerShell reference 7 parameters Its page in the reference

Opens CmdID with your command, read as PowerShell. It is read in your browser and sent nowhere.

Parameters

7 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the custom system message that you want to modify.
-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.
-NameThe Name parameter specifies a descriptive name for the system message.
-OriginalThe Original switch specifies whether to stop using the custom system message and start using the default system message.
-TextThe Text parameter specifies the text in the custom system message.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.