There has been a big change in recipient management from Exchange 2003 to Exchange Server 2007. Exchange Recipient Management is the second biggest administration component of Exchange 2007, which ranks as top Exchange key component with respectable incident
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Read the complete post at http://blogs.technet.com/asiasupp/archive/2007/04/26/using-the-exchange-management-shell-for-bulk-recipient-management.aspx