I just enrolled in a spreadsheet class being taught in Windows 07. I am trying to do this with Mac 08. So far the inconsistencies are minor but I'm wondering if it might just be better to learn in Windows. Considering it might be better to know Windows for jobs, I still don't want to invest in the Microsoft OS and Windows Office, and then clutter my Mac with them. Can anyone advise me which would be best? Do the differences become so much that I will have preferred learning Windows?