Exchange 2010 SP1 Managed Folder Settings

Hello, can someone tell me the syntax to change the MessageClass parameter for an existing ManagedContentSetting?
I can create a new one with New-ManagedContentSettings -FolderName "Deleted Items" -MessageClass IPM.Note* -Name "DeletedItemsContentSetting" -RetentionEnabled $True -RetentionAction PermanentlyDelete -AgeLimitForRetention 60

But I can't change it. I see that there is a Set-ManagedContentSetting, but it doesn't take the -MessageClass parameter...

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IMO, you need to delete and recreate the managed-folder-settings
"-MessageClass IPM.Note*" ...could be represented as "-MessageClass *"

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reference: (related to message class)
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