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Export-JournalRuleCollection

Use the Export-JournalRuleCollection cmdlet to export the journal rules in your organization to an XML file. Exchange PowerShell reference

From the Exchange PowerShell reference 5 parameters Its page in the reference

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Parameters

5 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the name of a journal rule.
-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.
-ExportLegacyRulesThe ExportLegacyRules switch specifies whether to export Exchange 2007 journal rules.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.