Brand new server, freshly installed Windows Server 2003 x64. installed Exchange Server 2007, completed setup, function perfectly. Then...I tried to run Exchange Server 2007 SP1. 2/3 way through the install it came up with some error about missing files and then ended the install.
I rebooted the server and nothing in exchange worked. Many missing files. Command prompt, setup /mode:Recover Server /DoNotStartTransport (from sp1 source). Got almost done and popped out Exchange Server Setup Encountered an Error. Tried again same thing. Tried to uninstall - will not do. The services all start now but it is not working right/completely.
Only error in Event viewer is a vague error about communication with the hub transport and only on startup.
Fortunately this was not in production yet. Though I had move 1 mailbox to it for testing plus synced basic public folders, free busy time to it form old Exchange Server 2003.