In March 1998, Netscape released most of the development code base for Netscape Communicator under an open source license. Only pre-alpha versions of Netscape 5 were released before the open source community decided to scrap the Netscape Navigator codebase entirely and build a new web browser around the Gecko layout engine which Netscape had been developing but which had not yet incorporated. The community-developed open source project was named "Mozilla", Netscape Navigator's original code name. America Online bought Netscape; Netscape programmers took a pre-beta-quality form of the Mozilla codebase, gave it a new GUI, and released it as Netscape 6. This did nothing to win back users, who continued to migrate to Internet Explorer. After the release of Netscape 7 and a long public beta test, Mozilla 1.0 was released on 5 June 2002. The same code-base, notably the Gecko layout engine, became the basis of independent applications, including Firefox and Thunderbird.