D4 EDV-Service und Softwaresysteme is a system integrator and software vendor located in Brilon, Germany. D4 has experience in the small and medium business markets since 2001. Our main goal is to implement scalable and reliable solutions that provide a value add to our customers’ daily business. Therefore we can rely on a wide knowledge of different hardware and software vendors. One of our focus products is Microsoft Lync. Around Lync we have great experience in implementing 3rd party products.