To build a successful Lync Server 2013 infrastructure to support basic functions such as instant messaging, web conferencing, and group chat, these services need to be built on a stable infrastructure. In other words, the services outside of Lync Server 2013 need to be healthy, available, and of sufficient performance to take on the added load of Lync Server 2013. It is also important to plan the hardware that will be used to support Lync Server 2013 and ensure that it is capable of supporting the new environment.