We are using Exchange 2007 as Messaging Solution. We have CCR mailbox server & 3 servers running Hub Transport, CAS on each of the servers. Yesterday we were implementing the Update Rollup1 for Exchange server 2007 on one of the Hubtransport & CAS server. Unfortunately during the installation on one of the server there was an unexpected shutdown of the server. After that Exchange Mail Submission & Transport services are not running. Also when I try to install the update rollup1 once again the installation exits saying that the installation ended prematurely. Now I want to restore the server to early stage. In this scenario can i use the /recoverswitch restore the exchange server. Also I have the system state backup.Can I use system state to restore the exchange server. Which one should I use to restore. Please guide me.