If you're new to OS X, you may have seen Apple's presentation software, Keynote, but you might also have a lot of PowerPoint files lying around. After a while of watching the same fonts, images, transitions and builds, those presentations can seem a little dated or unoriginal. If you want to try to liven things up, import them into Keynote. Simply open Keynote, select import an existing file, and chose a PowerPoint presentation. That's it. For a step-by-step video demonstration, watch this OS X tutorial.