Forums will be making significant UX changes to address key usability improvements surrounding search, discoverability and navigation.
To learn more about these changes please visit the announcement which can be found
As a product Exchange stopped shipping WMI classes for Management information in Exchange 2003. For versions of Exchange from 2007 you should use the Exchange Management Shell cmdlets eg Get-ExchangeServer
http://technet.microsoft.com/en-us/library/bb123873.aspx would be the most appropriate for what you want to do.
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