As I teach adult classes I am often asked what version of Excel should I get? I will say that most companies i run in contact with are still using Excel 2003. However many schools, colleges and universities have made the switch to Excel 2007. So what version do you get? My answer is ... The version you or your kids use most often. Sorry to be a little wishy washy but that is the best answer. It can be difficult to go back and forth between user interfaces like the 2 different version of office provide. I have read that many companies will not switch until they upgrade from Windows XP and at that time will upgrade to a newer version of Office. PC World put out a great article today on Excel 2011 and its differences between other versions. You can read the article here.