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Vangie Beal
Last Updated May 24, 2021 7:47 am

The codename given to a Microsoft operating system while in its development and beta phases. The Longhorn codename is the operating system that was released under the official name of Windows Vista. Vista was released worldwide on January 30, 2007.

See also “Microsoft Windows Vista – An introduction to its features, retail versions and security” in the Quick Reference section of Webopedia.