> critically relied on a VBA macro to handle billions Why is this surprising (or a secret)? It probably runs entirely bug-free and has done so for a decade or

> critically relied on a VBA macro to handle billions Why is this surprising (or a secret)? It probably runs entirely bug-free and has done so for a decade or three - it would be hard to imagine still running if it regularly had issues or sent just a small percentage of those billions of dollars to the wrong place. What does your modernization do better?