Q. The code name Longhorn was initially given to which one of the following?
Answer: Windows Vista
Notes: Windows Vista, an operating system by Microsoft for use on personal computers, was codenamed Longhorn in May 2001. It was originally expected to ship sometime late in 2003 as a minor step between Windows XP and Blackcomb, which was planned to be the company’s next major operating system release. Windows Vista was released worldwide in January 2007.