Script Resources for Exchange 2010
http://gallery.technet.microsoft.com/scriptcenter/site/search?f%5B0%5D.Type=RootCategory&f%5B0%5D.Value=Exchange&f%5B0%5D.Text=Exchange&f%5B1%5D.Type=SubCategory&f%5B1%5D.Value=Exchange2010&f%5B1%5D.Text=Exchange%202010 http://blogs.technet.com/b/heyscriptingguy/archive/2012/03/13/use-powershell-to-set-exchange-server-aliases-for-an-entire-organizational-unit.aspx