Legacy IT systems may seem reliable, but their hidden costs grow over time. Ageing hardware, rising support fees, custom fixes, and scarce specialist skills increase maintenance expenses. Security vulnerabilities, compliance challenges, and poor system integration slow innovation and create operational risks. Employees lose productivity due to manual workarounds and outdated reporting tools. By analysing system usage, archiving historical data, and retiring unused applications, organisations can reduce licensing costs, simplify audits, and modernise infrastructure. A structured decommissioning strategy helps preserve essential business data, improve performance, and free resources for innovation while lowering long-term operational and financial risk.