CmdID

CmdID / PowerShell / Cmdlets / Get

Get-RetentionPolicy

Use the Get-RetentionPolicy cmdlet to retrieve the settings for retention policies. Exchange PowerShell reference

From the Exchange PowerShell reference 2 parameters Its page in the reference

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Parameters

2 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the policy name.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.