The term legacy means legacy in German and indicates that existing, outdated data stocks and documents or inflexible computer architectures may no longer be used when new programs or operating systems are introduced. These data stocks often have to be converted into other file formats or imported into newer systems
. Inthis context, we speak of legacy.
As far as outdated, inflexible computer architectures are concerned, back in the 1980s when the term legacy was introduced, it meant terminal networks that had to be integrated into the new IT environments.