On my Exchange 2016, CU9 failed to install. Now MS Exchange Replication service (MSExchcangeRepl) will not stay running and MS Exchange RPC Client Access (MSExchangeRPC) will not start.
When setup (with /m:upgrade) is ran from command prompt the upgrade fails with a critical error at the end of the Mailbox Service section of the Upgrade. The setup log shows that there is an error when trying to mount mailbox database - specifically:
 Failed to mount database "MDB01". Error: An Active Manager operation failed. Error: The Microsoft Exchange Replication service may not be running on server Server16.McKeand.local. Specific RPC error message: Error 0x6d9 (There are no more endpoints available from the endpoint mapper) from cli_MountDatabase3 [Server: Server16.McKeand.local]
Restore from backup is not an option.
The questions are:
- Will Setup /m:RecoverServer do anything to the information store?
- Should I copy the .edb elsewhere before running the RecoverServer?
- Is there anything else I should try before running the RecoverServer?