I use Windows 98 every day when supporting medical devices. 98 is not the earliest version I support. There are a few machines in my care that run Windows 3.1 or some custom OEM build of Windows predating Windows 3.1. I recently had to fix a machine with an unknown release of early windows that has a monochrome touchscreen CRT display.<p>These machines are control computers for medical equipment. The scientific instruments do not get obsolete, so my clients continue to use them.<p>So, if you were thinking hospitals had merely old machines of XP vintage, think again. I not long ago fixed a GE MRI that ran on a Sun Ultra 10 powered by Solaris 2.5.1.