Hey there, I'm going to make the switch to OS X when the MBA 2011 is released. However, I have no experience with OS X at all. - I have grown up with Windows and have used nothing but that except some version of Linux when my computer broke down a couple of years ago. So, what should I look for? What file formats are there, what do they do? What is the equivalent of an .exe file in OS X and is there any compatibility issues or something else I should be aware of? What sort of applications would you suggest I'd use when using it for school only, perhaps a bit (or a lot) of programming once I get to that chapter of my education/life? - I'm thinking of software that could improve my productivity? Also in-built functions, probably mostly these, that exist in OS X. Any help that could help my transition would be greatly appreciated ! -I heard something about spaces and stuff, don't really know what it is, but that's the thing I'm talking about !