doperative writes "Much conventional wisdom about programs written by volunteers is wrong. The authors took money for research from Microsoft, long the archenemy of the open-source movement — although they assure readers that the funds came with no strings attached. Free programs are not always cheaper. To be sure, the upfront cost of proprietary software is higher (although open-source programs are not always free). But companies that use such programs spend more on such things as learning to use them and making them work with other software"