How to use the Unregister-PSSessionConfiguration Shell Command in Microsoft Exchange 2007
Deletes registered session configurations from the computer.
The Unregister-PSSessionConfiguration cmdlet deletes registered session configurations from the computer. This is an advanced cmdlet that is designed to be used by system administrators to manage customized session configurations for their users.
If you accidentally delete the default Microsoft.PowerShell or Microsoft.PowerShell32 session configurations, use the Enable-PSRemoting cmdlet to restore them.
Unregister-PSSessionConfiguration [-Name] <string> [-Force] [-NoServiceRestart] [-Confirm] [-WhatIf] [<CommonParameters>]