Trying to install CU 19, and getting [ERROR] The operation couldn't be performed because object 'XXX\OWA (Exchange Back End)' couldn't be found on 'YYY.ZZZ.local' YYY is the domain controller, and XXX is the Exchange server. I have no idea why it is looking for the OWA (Exchange Back End) directory on the domain controller. It is definitely on the Exchange server. this server is down until I can fix this, or restore from backup, and lose a day.