During this period, Microsoft was fairly quiet about what was being worked on, as their marketing and public relations focus was more strongly focused on Windows XP, and Windows Server 2003, which was released in April 2003.
Occasional builds of Longhorn were leaked onto popular file sharing networks such as IRC, Bit Torrent, e Donkey and various newsgroups, and so most of what is known about builds prior to the first sanctioned development release of Longhorn in May 2003, is derived from these builds.
prior to the release of Microsoft's Windows XP operating system, and continuing until November 2006.
Microsoft originally expected to ship the new version sometime late in 2003 as a minor step between Windows XP (codenamed "Whistler") and Windows 7 (codenamed "Blackcomb" and "Vienna").
Development of Windows Vista came to a conclusion with the November 8, 2006 announcement of its completion by co-president of Windows development, Jim Allchin.