Comment by gh02t

You've always been able to fully self host their core network controller, and not just on Windows. Linux has always been the preferred platform to host it on. However, the other more specialized apps in their ecosystem like their NVR software, etc was not self hostable independent of their controller hardware.

Right now it looks like UniFi OS server doesn't do anything the prior self hosted stack does already. Presumably though they are planning to roll out some of the other parts that currently aren't in the fully self hosted stack.