An updated version of Windows 2000 called “Odyssey” was also planned for the business market. Neptune was based on the Windows NT kernel, but was made specifically for home users. In the late 1990s, development of a new OS began, and during this time it was code-named “Neptune”.
Windows XP was also a major advance from the MS-DOS based versions of Windows in security, stability, and efficiency due to its use of Windows NT. It was also the first version of Windows to implement product activation to prevent piracy. Windows XP was the first Windows NT kernel-based OS designed for both the business and general consumer markets, and was much more stable than the Windows 9x line due to the improved codebase (heavily based on Windows 2000).
