Forgive the basic question, but if I've got one apex development environment, plus multiple run-time environments, all on 5.1, what options to I have for migrating to 18.1?
Can I upgrade all run-time environments to 18.1 first, and they can still deploy files exported generated from 5.1 development environment?
Or can I upgrade the development environment to 18.1 first and still import to 5.1 runtime environments?
Or will I have to do all together, ie upgrade the development environment and then have to upgrade each runtime before I can import updated applications?
Thanks in advance
Patrick