Take a time machine back to the 80s and try saying that again.
"The business world runs on IBM. These stupid lil personal computers? Don't waste your time with that s*&%"
Don't assume that the way things are now are how they will forever be in the future. Businesses are just locked into MS from prior use. It's hard getting people to change. The hurdles of moving your corporate email to Google Apps vs Microsoft Cloud are an example of one of them. It's easier to just stick with Microsoft without having to have your employees learn all over again.