Speaking as someone who professionally provides support to companies working in Linux-only environments (and yes, I am talking about office-type stuff with non-techie users), I would like to sprinkle a pinch of salt onto your statements ;-). There are definitely specialist requirements which can only be fulfilled by applications that run exclusively on Windows, but these market segments are shrinking (and I think they've shrunk to monopolist areas, where there's only one vendor offering a solution to a given problem). Perl can be a great help here, because it allows you to write the glue often needed to exceed employee expectation of what their computer can do.