In computing, a legacy system is an old method, technology, computer system, or application program, "of, relating to, or being a previous or outdated computer system", yet still in use. Often referencing a system as "legacy" means that it paved the way for the standards that would follow it. This can also imply that the system is out of date or in need of replacement.
In 2011, MS-DOS was still used in some enterprises to run legacy applications, such as this US Navy food service management system.
Although off-support since April 2014, Windows XP has endured continued use in fields such as ATM operating system software.
Windows XP is a major release of Microsoft's Windows NT operating system. It was released to manufacturing on August 24, 2001, and later to retail on October 25, 2001. It is a direct upgrade to its predecessors, Windows 2000 for high-end and business users and Windows Me for home users, and is available for any devices running Windows NT 4.0, Windows 98, Windows 2000, or Windows Me that meet the new Windows XP system requirements.
An electroencephalograph running on Windows XP. The medical industry's continued use of Windows XP is partly due to medical applications being incompatible with later versions of Windows.
