Windows 98 (codenamed Memphis) is a graphical operating system by Microsoft. It is the second major release in the Windows 9x line of operating systems. It was released to manufacturing on May 15, 1998 and to retail on June 25, 1998. Windows 98 is the successor to Windows 95. Like its predecessor, it is a hybrid 16-bit/32-bit monolithic product with an MS-DOS based boot stage. Windows 98 was succeeded by Windows 98 Second Edition on May 5, 1999, then by Windows ME (Millennium Edition) on September 14, 2000. Microsoft ended support for Windows 98 on July 11, 2006.
Development of Windows 98 began in the 1990s, initially using the codename "Memphis" to refer to the product. Many builds were released or leaked, starting with build 1351 on December 15, 1996 and ending with Windows 98 Second Edition.
The startup and shutdown sounds of Windows 98's final version was composed during circa September 1997 and were first featured in the Beta 2.1 (build 1602) in October that year.