Long story short, we have been in a Hybrid configuration for over a year and looking to minimize our Exchange infrastructure on-prem.
Currently we have two Ex2013 servers active A & B, each sever has roles CAS, HYB, MBX. We have however moved all mailboxes to O365. My end goal it remove server B from our environment and just utilize server A for AD Connect management. I have removed all reference on server B in the send/receive connectors.
Most of the decommission guides I've seen are referencing removing all together, or talk about retaining a single sever similar to what I'm attempting to accomplish. I believe me next step would be to uninstall Exchange server 2013 via add/remove programs on server B.
I just wanted to verify this is the correct step and that it would not manipulate our Hybrid configuration as server A would still be in production.