Internet Explorer 6

Internet Explorer 6 was introduced alongside Windows XP and was the longest running version of Internet Explorer until IE 7's release nearly six years later. IE 6 lacks many common features such as support for transparent PNG images. This version is the last version compatible with Windows NT 4.0 (albeit requiring SP6a), Windows 98, Windows 2000, and Windows Me, although it can also be unofficially installed on Windows 95.