One of our servers had it's Exchange services still set to disabled. The script to recover these after the patch didn't help. I got warnings like this:
WARNING: 'MSExchangeIS' did not exist, this is not an error as the sevice might have just been installed
WARNING: 'MSExchangeMailboxAssistants' did not exist, this is not an error as the sevice might have just been installed
WARNING: 'MSExchangeMailboxReplication' did not exist, this is not an error as the sevice might have just been installed
They did exist and I had to manually enable them (as well as the dependent Windows services). Server is functioning now, but how can I be sure that the update was installed successfully? And why weren't the services set to automatic again after the install?