You are discounting a very very large professional worker segment that relies of domain specific tools. We need more than a netbook with a browser. For e.g. In pharma, we wouldn't get any work done if we didn't use Windows. All of our software requires windows - analysis software, control software, automation software etc, etc. In our labs we're using software made for Windows XP on Windows 10, because it just works, and buying the newer version would cost thousands of dollars. If we were an architecture company we'd buy autocad or whatever, or if we were an accounting firm, we'd buy quickbooks or quicken, etc, etc.