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New-RetentionPolicy

Use the New-RetentionPolicy cmdlet to create a retention policy. Exchange PowerShell reference

From the Exchange PowerShell reference 8 parameters Its page in the reference

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Parameters

8 in the Exchange PowerShell reference
-NameThe Name parameter specifies the policy name.
-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.
-IsDefaultThe IsDefault switch specifies that this retention policy is the default retention policy.
-IsDefaultArbitrationMailboxThe IsDefaultArbitrationMailbox switch configures this policy as the default retention policy for arbitration mailboxes in your Exchange Online organization.
-RetentionIdThe RetentionId parameter specifies the identity of the retention policy to ensure mailboxes moved from an on-premises Exchange deployment to the cloud continue to have the same retention policy appl…
-RetentionPolicyTagLinksThe RetentionPolicyTagLinks parameter specifies the names of retention policy tags to be associated with this policy.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.