Hello, I am in the process of installing MBX role on a Windows 2008 R2 cluster. It is a new installation and the media I used is Exchange 2010 with SP1. Installation failed with errors related to Discovery Search mailbox. Before installing MBX roles, I have Exchange 2010 CAS/HT roles running on seperate machines with NLB thus I completed prerequisites like setup.com/pl, setup.com/ps, setup.com/p, setup.com/pd and I assume /p created this Discovery Search mailbox. I updated this CAS/HT to SP2 before trying to install MBX roles. I deleted "Discovery Search Mailbox" and reran Exchange 2010 MBX role installation. It completed the installation succesfully. I also update this machine with SP2. Now I need to recreate "Discovery Search Mailbox". Can I run setup.com/p from this new MBX server with Exchange 2010/SP2 and will it create the "Discovery Search Mailbox" properly? TIA Tom

http://social.technet.microsoft.com/Forums/en/exchange2010/thread/290ebc15-e30a-4636-98f9-3b61c75e41b0 Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

Hi Tom, Any updates?Frank Wang TechNet Community Support