We have extensive experience with Dos 3.0 -7.0, Windows 95, 98, 2000, XP home, XP media, and XP Professional.Windows 7 Home Premium, Windows 7 Professional (with virtualXP Mode)version local workstation operating systems. We have some experience with Vista Home premium and Vista Business, most of which is bad, it is a resource and memory hog, prerforms slow, and adding a Vista computer can disrupt existing "peer to peer" networks. Printing "peer to peer" to a Vista computer which is connected to the printer offers many problems as well, some Microsoft is apparently unable or unwilling to resolve at this time. We do not Reccomend Vista at all. And we reccomend waiting on Windows 8 until the first service patch is implemented, especially on mission critical systems We have some experience with Mac Os 5.0-9.0 Operating systems and integrating them into windows networks, but we are not really a Mac Shop.