Internet Explorer 4.0. IE 4.0 was integrated into the Windows 95 and Windows 98 operating systems and was freely available for the Mac OS, Solaris and HP-UX platforms. The distribution methods and integration of Internet Explorer into Windows subsequently became one of the subjects of legal proceedings between the US government and Microsoft over the abuse of a dominant market position. Internet Explorer 4.0 gained more than 60% market share at the beginning of 1999, contributing significantly to Microsoft winning over Netscape in the so-called first browser war.
