I have a clean install of Windows Server 2008 RTM.After completing all of the prerequisites, I attempt to install Exchange 2007 SP1 The Hub transport role fails and I get this error message: Summary: 6 item(s). 3 succeeded, 1 failed. Elapsed time: 00:17:20 Organization PreparationCompleted Elapsed Time: 00:05:38 Copy Exchange FilesCompleted Elapsed Time: 00:08:00 Management ToolsCompleted Elapsed Time: 00:00:25 Hub Transport RoleFailed Error:An error occurred. The error code was 2147504141. The message was The property cannot be found in the cache.. Elapsed Time: 00:03:16 Client Access RoleCancelled Mailbox RoleCancelled Any Ideas?