High Quality Content by WIKIPEDIA articles! Microsoft Flight Simulator X, also known as FSX, is the latest version of Microsoft Flight Simulator after Microsoft Flight Simulator 2004. It includes a graphics engine upgrade as well as compatibility with Windows Vista, having been marketed by Microsoft as the most important technological milestone in the series to date. It is the first version in the flight simulator series to be released on DVD-ROM. It is also the first version in the series to feature a new type of electronic distribution prevention using license keys, removing the need for the user to insert the game disc into their computer in order to run the software.