Ran RU 21 for Exchange 2010 SP 3 over the weekend and on reboot all the Exchange services were set to disabled. Set them all (except POP) to automatic and restarted and the server is back up. Searched for a long time looking for a list of the default Exchange 2010 SP3 and their startup setting i.e. Automatic, Automatic (delayed), Manual, or Disabled but could not find such a list. I found others who had experienced the same issue but none of the articles led to a list. I have only 1 Exchange 2010 server and it runs all three roles - mailbox, CAS, and transport. I also have a 2016 server that we are migrating to but I don't think that affects the Exchange 2010 services.
Thx
EWB