An admin in the organization ran /PrepareSchema from an Exchange 2019 ISO and it succeeded. The following day their application vendor said Exchange 2019 is not supported for mail integration. So the admin decided to continue Exchange migration by running /PrepareAD from an Exchange 2016 ISO and it succeeded. Now I have a source Exchange 2013 server with the following AD attributes:
Exchange Organization Object Version 16217
Exchange System Object Version: 13237
The goal is to Migrate from Exchange 2013->2016.
Since there is not going to be an Exchange 2019 server, can I still proceed with installing Exchange 2016 even though the Schema has already been extended for Exchange 2019?