Given the rapid rate of innovation in the software field, the costs of obsolete systems are usually much higher than most people realize. The only way to know for sure is to estimate that cost.
Some things in life are inevitable: death, taxes, and obsolete software. For extreme examples of obsolete software see this article by Kenneth Corbin: U.S. CIO aims to cut legacy spending, proposes IT modernization. While technologies fall out of favor, companies change, their markets grow, they are familiar with their software and may hang onto it long past its prime. Though there are many reasons not to change enterprise software, possibly the biggest is inertia. If it isn’t broken, why fix it?
The cost of not replacing old software must be estimated to answer the above question, especially for systems that have been in place for more than ten years. This cost is often much higher than expected and is incurred every year. Start the process by estimating the common costs of obsolete software listed below: