Basically name one thing you would change on the OS you use most frequently. So if you have windows then name one thing you dislike about windows same goes of course for OS X,Linux(name the distribution),Solaris and so on. You can also say what you don't like about you primary mobile OS like android or IOS. In my case OS X i don't like the fact that it doesn't have as much software available as Windows has. Ps. this has been copied from Lifehacker but i thought it would be nice to post it on Macrumors because the number of potential posters is quit a bit larger.