The Ubuntu bash feature was tongue in cheek. We have the points raised by naib plus a few others: - The ability to support multiple users as introduced with Windows 2000 (and still not implemented as well as Linux). - Windows Powershell. - UAC (defiantly not implemented as well as sudo, not to mention other security features present in Linux, as highlighted by MS themselves. Linux is not adopting Windows features, Windows has been adopting Linux (hell, you can go as far back as UNIX) features for years.