I just spent the morning trying to get our Exchange server back to a working state.
I attempted to do a CU8 install (I'm currently on CU3). I followed the instructions by prepping the Schema and the AD. Both completed successfully. No replication issues.
I ran setup.exe as an Administrator on our Exchange server. It stopped at 90% of checking prerequisites. It then threw up the error (please see attached screenshots), and died.
It's now working again, but I need to get this CU installed. ANyone have any insights at to what caused this?