Yeah, I have an old Linux box somewhere in the back of my closet at home. For a time, I was totally off Microsoft.... But guess what? Everyone uses Microsoft so it doesn't matter.
Earlier this Fall I was in Germany at a conference. I wanted to FTP a document from my office that I had written uses Star Office, but the place I was at was only geared for Microsoft applications.
How am I supposed to communicate with other researchers and businesses when the universal standard seems to be Microsoft applications?