The answer is very simple… there are people that still want to learn about older technologies (known as ‘legacy systems), concepts and methodologies. Why?  Well as an example their company may be still be using these older technologies and methodologies. A good example of this is the Windows 7 operating system. Many companies are still using this despite the upgrades. IT personnel that are unfamiliar with this operating system may require training in the software to manage it across the company.