Janice is a teacher and she spent her own money to upgrade some hardware in the classroom. Leo says he honors that kind of commitment. Janice wants to know if she could use Windows on her MacBook Air. Leo says absolutely, but she'll have to buy a separate version of Windows. There are two ways to do it: 1) run Windows natively using Boot Camp. She can run both OS's and select which one she wants when she boots up. 2) Run Windows virtually, within OS X. Options include Virtual Box which is free, Parallels, and VMware Fusion.
TechSoup.org, according to the chatroom, offers Windows 7 for $12 for educators. Microsoft also offers educational discounts.