Hi,
We currently running Exchange 2013 SP1 Cu4. I want to upgrade to Cu7.All the exchange servers are virtualized.
We have two mailbox servers and two CAS and one witness server at main office and one mailbox and CAS at DR site. Since I don't have a test lab, can I install the CU7 on the passive node or on the DR mailbox node first and make sure it works and then move on to the other servers? Will it break my exchange completely if something goes wrong with the CU7 on one of the mailbox server?
Please advise how to proceed.