Software as a Service offers a whole host of advantages compared with classic software installed and operated on the user’s premises. Firstly, it avoids software purchasing costs, thus reducing the investment risk. Less time is required for implementation, as the service provider merely needs to unlock the software for the user. SaaS also reduces the complexity of IT systems and allows the user to focus on his actual business. The time and user-dependent price models ensure that IT costs remain transparent at all times. As an Internet connection is the only requirement for use of the software, the latter can be accessed from mobile devices without any additional investment.