In 2000, EAGLE version 4.0 officially dropped support for DOS and OS/2, but now being based on Qt 3 it added native support for Windows and was among the first professional electronic CAD tools available for Linux. A 32-bit DPMI version of EAGLE 4.0 running under DOS was still available on special request in order to help support existing customers, but it was not released commercially. Much later, in 2015, a special version of EAGLE 4.09r2 was made available by CadSoft to ease installation under Windows 7.
