If you ever worked a job, you will see that they usually have a system in place, sometimes using a computer to keep track of sales and customers. But what if that system is dated so dated that it's using old hardware and an old OS. For example, the old video store that closed near me a couple years back, used to have a system in place that I believe still used DOS as their OS. I think they upgraded to like Windows 98 eventually, but that was just a few years ago I want to say. I don't know if they ever upgraded their systems in all those years.