"legacy-system." YourDictionary, n.d. Web. 19 January 2019. <https://www.yourdictionary.com/legacy-system>.
legacy-system. (n.d.). Retrieved January 19th, 2019, from https://www.yourdictionary.com/legacy-system
legacy system - Investment & Finance Definition
information technology or other automated system that is technologically
obsolete. It may be too expensive to update or replace, but it is still needed
for the company’s operations and thus is kept operational even though a newer
system is in use.