Legacy mode
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Legacy mode is the state of a computer software system that is no longer supported or upgraded by the original manufacturer yet continues to execute satisfactorily for the user(s) in perpetuity. In some cases, legacy mode refers to backward compatibility.
The computer mainframe era saw many applications running in legacy mode. In the modern business computing environment, n-tier, or 3-tier architectures are more difficult to place into legacy mode as they include many components making up a single system. Government regulatory changes must also be considered in a system running in legacy mode.
Virtualization technology allows for a resurgence of modern software applications entering legacy mode. As system complexity and software costs increase, many computing users are keeping their current systems permanently in legacy mode.
