I was reading about this while researching Windows Server 2022 upgrade.

It's called Hot Patching. I wonder how this could interact with SmarterMail and IIS.

"Hotpatching is a new way to install updates on a Windows Server 2022 Datacenter: Azure Edition (Core) VM that doesn’t require a reboot after installation, by patching the in-memory code of running processes without the need to restart the process."

Ron