In times of E-Business, more and more transactions are conducted electronically. Especially in the context of electronic business negotiations there is a rising need for support provided by the communication medium. This need led to the development of several Negotiation Support Systems (NSSs) within the recent years. However, diffusion of NSSs into practice is scarce. The Negolook prototype developed in the course of our research follows the concept of such NSSs whilst being integrated into traditional business communication systems. It aims to bridge the gap between the uttered need for negotiation support and its actual use in practice. In this paper we present the prototype itself, a theoretical evaluation and, furthermore, we identify future research activities.