Background of WINDOWS se7en

Circa 2000, Windows XP and its server counterpart Windows Server 2003 (codenamed Whistler) were planned to be followed-up by a major release of Windows that was codenamed Blackcomb (both codenames refer to the Whistler-Blackcomb resort) and scheduled for a 2005 release.^{[citation needed]} Major features were planned for Blackcomb, including an emphasis on searching and querying data and an advanced storage system to enable such scenarios. In this context, a feature mentioned by Bill Gates for Blackcomb was "a pervasive typing line that will recognize the sentence that [the user is] typing in.

Later Blackcomb was delayed and an interim minor release, codenamed "Longhorn", was announced for a 2003 release.^[6] Even more delays later, Longhorn became a major release and accumulated many features initially planned for Blackcomb, including the advanced storage system (titled WinFS) as well as the searching system (christened Windows Search). Later Longhorn shed a few features, including WinFS but retaining the searching capabilities, en route to a 2007-launch as Windows Vista.

SOURCE :- WIKI