Legacy-system meaning

An older computer system such as a mainframe or minicomputer. It may also refer to only the software (see legacy application).
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An information technology or other automated system that is technologically obsolete. It may be too expensive to update or replace, but it is still needed for the company’s operations and thus is kept operational even though a newer system is in use.
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(computing) An old computer system or application program that continues to be used because the user (typically an organization) does not want to replace or redesign it.
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