Legacy applications not only have old technology, often they also are maintained with legacy development processes.
After successfully migrating their mainframe application portfolio to a windows environment, RDW decided to bring their development process completely under Visual Studio.
Delta Software Technology provided RDW with a plugin for Delta IDS (ADS on Visual Studio) to support RDW’s hybrid strategy where runtime environment consists of Delta ADS COBOL modules and C# modules. Together they provide the necessary business functionality.
More about this here:
https://delta-software.com/link.php?en=6378