A real ERP migration: 12 VB6 features moved to C# .NET 10 with Claude Code, measured in an industrial setting

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arXiv 2608.28972 (29 August 2026) reports a case study inside a real company migrating 12 features of varying complexity from a corporate ERP written in Visual Basic 6 to C# .NET 10, using one version of the Claude Code agent, and evaluates both effectiveness and efficiency. Legacy modernization is the use case most often asserted and least often measured, so a named-stack, named-agent, feature-count case study is worth more than another SWE-bench delta. Pair it with 2608.30300 (Update from Hell), published two days later, which tests whether coding agents can survive dependency upgrades that break behavior without announcing it.