Legacy system  From Wikipedia, the free encyclopedia
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A legacy system is an old method, technology, computer system,
or application program.  The term "legacy" may have little to do
with the size or age of the system — mainframes run 64-bit Linux
and Java alongside 1960s vintage code.  Although the term is
most commonly used to describe computers and software, use of
the word legacy as an adjective may also describe human
behaviors, methods, and tools. For example, timber framing using
wattle and daub is a legacy building construction method.  The
term first came into use in 1990 meaning "of, relating to, or
being a previous or outdated computer system."[1] A more recent
definition says that "a legacy system is any corporate computer
system that isn't Internet-dependent."[2]  The legacy system may
or may not remain in use. For a variety of reasons, a legacy
system may continue to be used. It may be that the system still
provides for the users' nee