Prior to the release of version 1.0 of Netscape Navigator, version 0.9 was released in October 1994 as Mosaic Netscape. The naming difference was the result of a change in company names by the developers, from Mosaic Communications Corporation to Netscape Communications, in December 1994.
Netscape Navigator was effectively the first entrant into the Internet browser market and enjoyed little real competition until the release of Internet Explorer in 1995. Netscape initially had the lead in the Internet browser market, but Microsoft's aggressive development eventually pushed Internet Explorer as market leader in 1998. Netscape Communications was later acquired by AOL for $4.2 billion in November 1998.