Probably has to do with compatibility. (Score 1)

I say this because of a horror story my mother recently related to me, and it makes a good example for why people use these under-performing Windows applications: her work is still using IE 5 because only it is compatible with the software they have to use in order to run their business. Did you hear that? I'm not kidding. They are forced to use INTERNET EXPLORER FIVE. This almost makes me cry every time I think about it.