Microsoft announced the end of Visual Studio LightSwitch in October 2016. The apps still run, on a Silverlight or HTML client over WCF RIA Services, but the tooling is gone, so nobody can change them. The only people who can make sense of the generated code are the ones who built with LightSwitch when it was alive.
I built four production systems on LightSwitch, payroll, used-car wholesale, right-of-way appraisal and a food plant, and I have moved off it. The data model and the business rules survive; the generated client is what gets replaced, screen by screen, on a stack you can work in every day and your team can hire for.
Your Silverlight app has no browser to run in. The code still says what it does.
Delphi is alive. Your Delphi 5 codebase, on components that no longer compile, is not.
Your records are in Notes databases. Someone has to read the Notes data model to get them out.