legacy system

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Related to Legacy systems: Legacy software, Legacy technology

legacy system

[′leg·ə·sē ‚sis·təm]
(computer science)
A computer system that has been in operation for a long time, and whose functions are too essential to be disrupted by upgrading or integration with another system.

legacy system

(jargon)
A computer system or application program which continues to be used because of the cost of replacing or redesigning it and often despite its poor competitiveness and compatibility with modern equivalents. The implication is that the system is large, monolithic and difficult to modify.

If legacy software only runs on antiquated hardware the cost of maintaining this may eventually outweigh the cost of replacing both the software and hardware unless some form of emulation or backward compatibility allows the software to run on new hardware.

legacy system

An older computer system such as a mainframe or minicomputer. It may also refer to only the software (see legacy application).
References in periodicals archive ?
Sometimes legacy systems operate reasonably well within their original design expectations and it seems counterintuitive to toss them out for something marginally better.
Your ability to upgrade legacy systems depends largely on what you have done since the original system installation to keep current with new software versions.
Almost 1/3 of IT spending in 2003 will go maintaining and updating legacy systems
Those responsible have a very straightforward view of legacy systems.
Although emerging technologies bring new opportunities to create new types of business solutions, the reality is that legacy systems hold the major key to future success," say Christopher Slee and Malcolm Slovin, partners at Waltham, MA-based Computer Sciences Corp.
While you're at it, you also should develop a strategy for dealing with your legacy systems.
A leader in multi-channel contact solutions and service management for government, Lagan offers an open, java-based architecture designed to easily integrate with mainframe and legacy systems, data warehouses, or other back-office systems.
It also allows insurers--both life and property/casualty companies--to connect their information-rich but outdated legacy systems to new, Web-based technology.
ApplinX provides the simplest and most convenient way to create powerful Web services from a legacy system, which can then be used in a Service-Oriented Architecture," said Joe Gentry, vice president of Enterprise Transaction Systems for Software AG.
J2EE's ability to run on every platform is its greatest selling point since insurers' legacy systems usually resemble patchworks using IBM Series 1, Unix or Windows.
ECM is an ideal solution for banks interested in further automating business processes and extending and leveraging the capabilities of legacy systems in order to realize increased efficiencies and strengthen compliance across the enterprise.