Mute on Lock - Wait, it doesn't already?

I'm mostly posting this because I'm shocked that it's not an option - or the default - in the Windows operating system. Seriously, you need a third-party utility to mute the speakers when you lock your PC? To kill the notification sounds and other drivel that would periodically spout from a box that can't even be accessed to stop them? Wow. Way to step up to the plate, Mute on Lock; Microsoft, get your act together!
[via AddictiveTips & Lifehacker]