Q: e.g MS Windows environments include 98, NT, 2000, XP, Vista. What about Mac? tell me please Thanks a million
A: Leopard, Tiger etc are just different upgrade versions of Mac OS X over the years. Current machines just have OS X 10.5 'Leopard' loaded. You can buy virtualisation software (or boot up into a different OS), where you can run Windows XP or Vista (perhaps the older ones - dunno), or pretty much any Linux installation - I've Windows XP, Ubuntu and Kubuntu on mine.