I just bought software off of the Ultimate Steal website for students and I am having trouble installing it with VMware fusion. It keeps asking for a CD, but I got the software as a download.
You can sometimes use a program like Crossover or Wine to run Windows software on a Mac, but not always and not without bugs.
OpenOffice and NeoOffice will both run on your Mac, both are totally free, and both are basically the same thing as MS Office.....only free.