What is a Legacy System?
Definition
Outdated software still in use due to business criticality despite newer alternatives existing. Legacy systems create migration challenges, security risks, and integration limitations but contain valuable historical data and embedded business processes."
Why This Matters
Legacy systems are costly to maintain and difficult to integrate yet contain valuable data and embedded knowledge. Migration carries risk but becomes necessary. Plan legacy system retirement as part of new software implementation.
Related Terms
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Essential Connections
Migration
Implementation & Deployment
Transferring from legacy systems to new software including data migration, process migration, integration migration, and user migration.
Data Migration
Implementation & Deployment
The process of transferring existing data from legacy systems to new software including data extraction, transformation, validation, mapping, and import.
System Integration
Software Features & Capabilities
Connecting multiple software systems to work together through APIs, middleware, or integration platforms.
On-Premise
Software Features & Capabilities
Software installed and run on customer's own servers and infrastructure rather than vendor-hosted cloud.
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