In addition to those reasons generally a computer system is a business tool. If a machine is doing what a company needs then why spend valuable time and money

In addition to those reasons generally a computer system is a business tool. If a machine is doing what a company needs then why spend valuable time and money upgrading it to something else that will do exactly the same job. I do appreciate the problem of security patches, but XP is pretty rock solid as a platform so for many businesses their tool does what they need.