Most big companies, especially multinationals, have their IT department with people who will solve any problem when the company faces it. That is a mandatory thing to do, to have experts in the IT field to help you when problems appear. That does not mean having employees in-house to do that is mandatory. It is an option, but each company can decide if that is best for them. If you are not a multinational, hiring in-house computer help may be something that you will spend too much money without needing it.