Open office is almost identical to Microsoft Office but it's 100% free. I tried it once when I was sick of constantly paying to upgrade microsoft and it worked perfectly fine but things were put in different places and worked just a touch different. I have spent enough time learning the microsoft system that I don't want to change. If you take the time to learn how to use office I'm sure it's absolutely no different other than the price. To the OP sorry I did check my files on a computer with open office and you can open them but the formatting gets all screwed up the way I have it done which makes all the equations not work.