'Longhorn' development started afresh, building on the Windows Server 2003 code-base, and re-incorporating only the features that would be intended for an actual operating system release. Faced with ongoing delays and concerns about feature creep, Microsoft announced on August 27, 2004, that it was making significant changes. Many of Microsoft's developers were also re-tasked with improving the security of Windows XP. 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. 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. Microsoft originally expected to ship the new version sometime late in 2003 as a minor step between Windows XP (codenamed 'Whistler') and the next planned major release of Windows, code-named 'Blackcomb'. The development of Windows Vista began in May 2001, prior to the release of Microsoft's Windows XP operating system, and continuing until November 2006.

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