Today, I had to make a Powerpoint for work, so I decided to try making a Keynote presentation in iCloud and download it as a Powerpoint when I was done. Well, I made the Keynote slides, finished and let is save. Then, I right clicked and downloaded it as a Powerpoint presentation. I then opened it in Powerpoint 2010 to check for formatting and it looked the same. No formatting errors or anything, it was just how I made it in Keynote. "It just worked." The original Keynote slides were started on my rMBP in Safari, then continued and finished on a Windows 7 machine in Chrome. Good job Apple!