It introduced a significantly redesigned and was the first version of Windows to use in an effort to reduce its. Windows XP was a major advance from the versions of in security, stability and efficiency due to its use of Windows NT underpinnings. An updated version of was also originally planned for the business market however, in January 2000, both projects were shelved in favor of a single OS codenamed 'Whistler', which would serve as a single OS platform for both consumer and business markets. Development of Windows XP began in the late 1990s as ', an operating system built on the which was intended specifically for mainstream consumer use.
