On one hand, the evolution of marketing business strategies over time delineated the current characteristics of CRM strategies; on the other hand, the evolution of information and communication technologies enabled the adoption of different and more evolved marketing approaches over time, giving birth to the current CRM systems. These two dimensions of CRM are extremely intertwined and, as a matter of fact, the emergence of CRM strategies, concepts, and practices would not be possible without the appearance of new and evolved ICT resources.