Mainframe applications are very different from "regular" Linux server applications. Migrating would almost certainly mean a complete redesign and rewrite of exi

Mainframe applications are very different from "regular" Linux server applications. Migrating would almost certainly mean a complete redesign and rewrite of existing software. For industries where stability is paramount (banking, hospitals) it just isn't worth it. Keep in mind that the applications running on these mainframes were written in COBOL 30+ years ago, often with poor documentation and specification. It is a tremendous task to port something like that and have the new system behave 100% like the old system.