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Windows XP is a line of proprietary operating systems developed by Microsoft for use on general-purpose computer systems , including home and business desktops, notebook computers , and media centers . The letters "XP" stand for e XP erience . [2] Codenamed " Whistler ", after Whistler , British Columbia , as many Microsoft employees skied at the Whistler-Blackcomb ski resort during its development, Windows XP is the successor to both Windows 2000 and Windows Me , and is the first consumer-oriented operating system produced by Microsoft to be built on the Windows NT kernel and architecture . Windows XP was first released on October 25 , 2001 , and over 400 million copies are in use, according to a January 2006 estimate by an IDC analyst. [3] It is succeeded by Windows Vista , which was released to volume license customers on November 8 , 2006 , and worldwide to the general public on January 30 , 2007 .

Windows Vista is a line of graphical operating systems used on personal computers , including home and business desktops , notebook computers , Tablet PCs , and media centers . Prior to its announcement on July 22 , 2005 , Windows Vista was known by its codename " Longhorn ". [1] Development was completed on November 8 , 2006 ; over the following three months it was released in stages to computer hardware and software manufacturers, business customers, and retail channels. On January 30 , 2007 , it was released worldwide to the general public, [2] and was made available for purchase and downloading from Microsoft 's web site. [3] The release of Windows Vista comes more than five years after the introduction of its predecessor, Windows XP , making it the longest time span between two releases of Microsoft Windows .

Windows Vista contains hundreds of new features ;l