The development of Windows Vista (codenamed Longhorn) began in May 2001, prior to the release of Microsoft's Windows XP operating system, and continued until November 2006, where it was eventually released to manufacturing. Windows Vista was then released generally to retail on January 30, 2007.
Background
Microsoft originally expected to ship Vista sometime late in 2003 as a minor step between Windows XP (codenamed "Whistler") and the next planned major release of Windows, code-named "Blackcomb". Vista's original codename, "Longhorn", was an allusion to this plan: While Whistler and Blackcomb are large ski resorts in British Columbia, Longhorn is the name of a bar between the two mountains that Whistler's visitors pass to reach Blackcomb.
Gradually, Windows "Longhorn" assimilated many of the important new features and technologies slated for "Blackcomb", resulting in the release date being pushed back a few times. Many of Microsoft's developers were also re-tasked with improving the security of Windows XP. Faced with ongoing delays and concerns about feature creep, Microsoft announced on August...