The following steps were performed: Uninstalled the B2 CA role. Uninstalled the MSH RC2. Installed Powershell ran the RC0 upgrade w/ "setup /m:upgrade" which was successful upon attempting to re-install the CA role "setup /m:install /role:ca" "the virtual directory Exchweb already exists. Opened ESM, which advised AD was out of synch with the server, and removed the virtuals via the exchange powershell. Now, I'm getting the following error when running setup with the above parameters: ********************** Y:\ISO\Exchange 12\Exchange 2007 RC0\Install>setup /mode:install /role:ca Welcome to Microsoft Exchange Server 2007 Unattended Setup Preparing Exchange Setup The following server roles will be installed Client Access Role Performing Microsoft Exchange Server Prerequisite Check Configuring Microsoft Exchange Server Client Access server role ......................... FAILEDAn unexpected error has occurred and a Watson dump is being generated: Could not find a part of the path 'C:\Program Files\Microsoft\Exchange Server\ClientAccess\sync\\web.config'. Could not find a part of the path 'C:\Program Files\Microsoft\Exchange Server\ClientAccess\sync\\web.config'. Exchange Server setup encountered an error. Y:\ISO\Exchange 12\Exchange 2007 RC0\Install> ************************************** The above path is definitely not under ClientAccess. In fact, the only dir under is OAB. How do I get around this? I suppose I could stand up a new CA only server, but I'd rather not have to do this. Thanks in advance!