With Exchange 2010, use Remote Powershell

With Exchange 2010, you should be using Remote Powershell. Below are some articles to help get you started.

How to call Exchange 2010 cmdlet's using Remote Powershell in code
http://blogs.msdn.com/dvespa/archive/2009/10/22/how-to-call-exchange-2010-cmdlet-s-using-remote-powershell-in-code.aspx

Remote Powershell Sample Explained...
http://blogs.msdn.com/dvespa/archive/2009/10/22/remote-powershell-sample-explained.aspx

Programmatic Access via Remote PowerShell in Exchange Server 2010
http://msexchangeteam.com/archive/2009/11/02/453016.aspx

Connect Remote Exchange Management Shell to an Exchange Server
http://technet.microsoft.com/en-us/library/dd297932.aspx

Install Windows Management Framework
http://technet.microsoft.com/en-us/library/dd335147.aspx