Envision a situation where a legacy system is becoming increasingly difficult and expensive to maintain. Discuss how software evolution models might be utilized to address the challenges posed by the outdated system.

When dealing with an outdated and expensive-to-maintain legacy system, a reengineering approach can be beneficial. Reengineering involves analyzing, redesigning, and re-implementing the system to enhance its maintainability and reduce costs. This approach helps address challenges posed by legacy systems effectively.