I completed the ADprep and started the update to CU21
Everything seem to be going fine but then I started getting errors
The process fails while step:
Mailbox role: Transport
Microsoft ExchangeServiceHost will not start.
Unable to start most of the MsExchnage Services
Web UI does not start at all.
Also getting tons of Event ID 2280 errorw:
The Module DLL C:\Program Files\Microsoft\Exchange Server\V15\Bin\kerbauth.dll failed to load. The data is the error.
