The first goal of this thesis is to expound the concept of CRM - Customer Relationship Management. In the thesis are discussed about different approaches to CRM. Customer relationship management should be seen as an enterprise-wide on customer oriented strategy. This term is often understood as a CRM system. To achieve this concept is currently using CRM tools that are part of the CRM system. Furthermore, the thesis described architecture and functionality of the CRM system. As information technology continues to evolve, in the thesis are also discussed trends in CRM systems. The biggest trend is software as a service based solutions (SaaS). The next section will focus on CRM systems based on SaaS. First, defines what Cloud Computing is. Is...