Windows 98

Windows 98 (codenamed Memphis) is a graphical operating system released on June 25, 1998 by Microsoft and the successor to Windows 95. Like its predecessor, it is a hybrid 16-bit/32-bit monolithic product based on DOS.

The first edition of Windows 98 is designated by the internal version number 4.10.1998, or 4.10.1998A if it has been updated with the Security CD from Microsoft. Windows 98 Second Edition is designated by the internal version number 4.10.2222A,1 or 4.10.2222B if it has been updated with the Security CD from Microsoft. The successor to Windows 98 is Windows ME though ME didn't have MS-DOS support.

Windows 98 is the last operating system to run on MS-DOS.