Office365 is pretty much just Exchange underneath. And tons of larger orgs still use on-prem Exchange. Microsoft just announced the next version of on-premise E

Office365 is pretty much just Exchange underneath. And tons of larger orgs still use on-prem Exchange. Microsoft just announced the next version of on-premise Exchange for launch in 2024. As cloud costs ratchet up and the weaknesses become more apparent, I suspect you'll see orgs start migrating back away from the cloud.