The world of computer technology is constantly evolving. Eventually that old system of yours will become Not Supported and Obsolete and nobody will be able to maintain or fix it when it breaks.  You do not want to be in a position where you are stuck with a dead end system that nobody knows how to work on.    Obsolete systems, by nature, become more and more unreliable every day.  Software programs keep changing their minimum required specifications, leaving you behind.  Servers fill up and slow down.  While your system may become obsolete, it is more important than ever to keep your business running.  How you go about implementing a major IT Modernization project in your computing environment can make or break a company. It takes a lot of experience and skill to plan for major change or rebuilding of your entire computing environment, while preserving the major investment you have in the data you have accumilated over many years.

An old computer system is like an old used car.  Eventually it will not perform the way you want it to and it can become expensive and unreliable.  There is always a point where it just makes good business sense to go through a well planned IT Modernization project.