Windows (server and desktop versions) will throw up a message dialog on the screen. It will also start to kill off processes just enough to resolve the low memo

Windows (server and desktop versions) will throw up a message dialog on the screen. It will also start to kill off processes just enough to resolve the low memory situation. During this - unlike Linux - you can actually use the mouse, CLI and close programs yourself. On top of that server applications like IIS has built-in watchdogs. If an IIS process grows to use too much memory (60% IIRC) or excessive CPU, the watchdog will recycle the process.