Difference between windows 2000 and windows 07?

Windows 2000 is an operating system developed about 10 years ago. During the past 10 years Microsoft innovated their Operating systems (XP,Vista , and Windows 7) to automatically recognize devices such as printers, cameras, scanners, USB drives, Etc. that the user could "plug amd play" the devices without first installing drivers. Also advanced security features have been incorperated into internet explorer, Windows Media Player, and the network devices. Lastly are the bells and whistles such as previewing an item minimized to the taskar or viewing multiple Windows at the same time(snap to).