Friday Challenge: What can your OS do that mine can't?

OK, time for a new feature, one that I'm calling "Friday Challenge." Today's challenge: What can your OS do that mine can't?

A piece I published earlier has generated a lot of feedback from readers. But the problem that I'm feeling with much of the feedback is that it's really little more than "my OS is better than your OS ... na na nana na!" So, here's my challenge to you. Give me an example of what your OS (Windows/Mac/Linux) can do (and it has to be a useful, end user feature) that can't be achieved on another OS.

Rulz: Running specific apps designed for a particular OS doesn't count, but feel free to throw in opening certain file formats. Points will be awarded! Point will also be awarded/deducted if someone points out that something that someone else has said can't be done can actually be done. Extra points if that action is doable using free software! Also, this is all in good fun, so keep it civil, OK!

Go!