Windows Internet Explorer 7 (IE7) (codenamed Rincon) is a web browser for Windows. It was released by Microsoft in October 2006. Internet Explorer 7 is part of a long line of versions of Internet Explorer and was the first major update to the browser since 2001. It is the default browser in Windows Vista and Windows Server 2008 and can replace Internet Explorer 6 on Windows XP and Windows Server 2003 but unlike version 6, this version does not support Windows NT 4.0, Windows 98, Windows 98 SE, Windows 2000, and Windows Me.