::Windows Server 2008 operating system prerequisites
::for Exchange Server that will host 
::Hub Transport, Client Access, and Mailbox server roles 

::Install Windows PowerShell
::included in Windows Server 2008 (but not installed by default)
ServerManagerCmd -i PowerShell

::Install the necessary IIS prerequisites
ServerManagerCmd -i Web-Server
ServerManagerCmd -i Web-ISAPI-Ext
ServerManagerCmd -i Web-Metabase
ServerManagerCmd -i Web-Lgcy-Mgmt-Console
ServerManagerCmd -i Web-Basic-Auth
ServerManagerCmd -i Web-Digest-Auth
ServerManagerCmd -i Web-Windows-Auth
ServerManagerCmd -i Web-Dyn-Compression

::Install the RPC over HTTP proxy feature
::If the server will support Outlook Anywhere clients
ServerManagerCmd -i RPC-over-HTTP-proxy