Windows Vista

Windows Vista is the name of a major version of Microsoft Windows, a proprietary graphical operating system used on personal computers, including home and business desktops, notebook computers, and media centers. Prior to the announcement of the Vista name on July 22, 2005, it was known by its codename Longhorn, after the Longhorn Saloon, a popular bar in Whistler, British Columbia.[1] As of July 2006, Windows Vista is in beta testing; Microsoft has stated the scheduled release dates for Windows Vista are currently November 2006 for business editions, and January 2007 for consumer editions.[2] These release dates come more than five years after the release of Windows XP, Microsoft's current consumer and business operating system, making it the longest time span between releases of Windows.
According to Microsoft, Windows Vista has hundreds of new features, such as an updated graphical user interface and visual style dubbed Windows Aero, improved searching features, new multimedia creation tools such as Windows DVD Maker, and completely redesigned networking, audio, print and display sub-systems. Microsoft claims that Vista also aims to increase the level of communication between machines on a home network using peer-to-peer technology, making it easier to share files, password settings, and digital media between computers and devices. For developers, Vista introduces version 3.0 of the .NET Framework, which aims to make it significantly easier for developers to write high-quality applications than the Windows API. High-end editions of Vista are expected to include Microsoft's Virtual PC, so that previous versions of Windows can be run simultaneously with Windows Vista on the same machine, with a view to running applications incompatible with Windows Vista.
Microsoft's primary stated goal with Vista, however, has been to improve the state of security in the Windows operating system. Amongst the many common criticisms of Windows XP, the most significant has been its commonly exploited security vulnerabilities, and an overall susceptibility to malware, viruses and buffer overflows. In light of this, Microsoft chairman Bill Gates announced in early 2002 a company-wide 'Trustworthy Computing initiative' which aims to incorporate security work into every aspect of software development at the company. Microsoft claimed it prioritized improving the security of Windows XP and Windows Server 2003 above finishing Windows Vista, which has significantly delayed its completion.
http://en.wikipedia.org/wiki/Windows_Vista