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Discover LudwigThe phrase "legacy system" is correct and usable in written English.
You can use it to describe an outdated or obsolete computer system or software program. For example, "The company is still running on a legacy system that was installed in the 90s."
Dictionary
legacy system
noun
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.
Exact(56)
Absent meaningful reform, we will not support an increase in financing to maintain the remnants of a 30-year-old legacy system that serves too few Americans today.
(IBM's legacy system, first introduced in 1988).
can aggregate or modify, i.e., refactor, the legacy system.
Each package allows some legacy system artefact to be modelled.
Legacy system interoperability information model for LA data exchange.
For all its global dominance, GSM TDMA is becoming a legacy system.
A "legacy system" is something that would look at home in a 1950s movie.
Similar(4)
The UK has decades of legacy systems".
"We're limited by Visa and MasterCard's legacy systems".
But large businesses shouldn't feel restricted by legacy systems.
But they have legacy systems and their network of agents to cope with.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com