Caused by the movement to a sustainable development, Green IT is still a big trend and more than just a buzz phrase. Especially data centers are working on their own energy efficiency. Additionally, Green IT needs to involve end users as the ones who play a decisive role in the utilization phase of ICT1 devices as well as software products according to the idea of Life Cycle Thinking. In our chapter, we describe some typical end user software usage scenarios and take measurements to ascertain the energy consumption induced by these. We compare the energy consumption of word processors as well as the energy consumption induced by web browsers. In regard to sustainable development, the user has to be involved in the movements of Green IT.