Microsoft CTO Russinovich discovers vulnerabilities in his legacy code through Claude

Microsoft's CTO Mark Russinovich used Claude Opus 4.6 to analyze his 40-year-old Apple II software, demonstrating AI's capability in legacy code review. The AI successfully identified multiple vulnerabilities in the ancient machine-language code after decompiling it, highlighting how modern AI tools can enhance security assessment of legacy systems and potentially modernize older codebases.