there is a simple reason for this.
99% of companies issue their end users with IT kit without any sort of training on how to use it. I have only ever once witnessed an instance where training was mandatory, each user had to sit with a trainer going through the new features of windows and office. If all companies did this then us support staff would have little to do. There are numerous times i have been asked by a user who has logged a fault because they can't do the simplest of things such as printing, connecting a projector saving a file, creating an email signature, etc.