Netscape Navigator, also known as Netscape, is a proprietary web browser that was popular uring the 1990s. Once the flagship product of Netscape Communications Corporation and the dominant browser in usage share, its user base had almost completely evaporated by 2002, partly due to the inclusion of Microsoft's Internet Explorer web browser with the Windows operating system, but also due to lack of significant innovation after the late 1990s. Netscape's demise was a central component of Microsoft's antitrust trial, where the court ruled that (among other things) bundling Internet Explorer with Windows was an illegal monopolistic business practice.