CmdID

CmdID / PowerShell / Cmdlets / Get

Get-MessageCategory

Use the Get-MessageCategory cmdlet to retrieve a message category from the specified mailbox. Exchange PowerShell reference

From the Exchange PowerShell reference 3 parameters Its page in the reference

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Parameters

3 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the name of the message category to be retrieved.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.
-MailboxThe Mailbox parameter specifies the mailbox that you want to view.