All Communications Server (CS) 2007 deployments will require both client and server Communications Server 2007 licenses and many will require SQL Server licenses as well.

Pictured is a simplified enterprise deployment of Communications Server 2007 supporting IM, voice and video calling between Communicator users, and on-premise Web conferencing, but not voice communications through the company’s PBX. Each user, shown at the bottom, will require both a Communications Server 2007 Standard Client Access License (SCAL) and an Enterprise Client Access License (ECAL) for the rights to access these features. Each user will also require a Communicator 2007 license (Communicator) for the right to use this Communications Server 2007 client-side companion software on his PC.

Each of the three Front-End server machines, shown in the center, requires a Communications Server 2007 Enterprise Edition (CS EE) license because they are linked together as part of a cluster for high availability. The Edge Server (middle left), which provides access for external users, requires only a Communications Server 2007 Standard Edition (CS SE) license. The Archiving Server (top left) does not require a Communications Server 2007 server license of any kind-Microsoft makes an exception for Communications Server 2007 servers dedicated to this specific purpose.

All Communications Server 2007 deployments will require both client and server Communications Server 2007 licenses and many will require SQL Server licenses as well.

Pictured is a simplified enterprise deployment of Communications Server 2007 supporting IM, voice and video calling between Communicator users, and on-premise Web conferencing, but not voice communications through the company’s PBX. Each user, shown at the bottom, will require both a Communications Server 2007 Standard Client Access License (SCAL) and an Enterprise Client Access License (ECAL) for the rights to access these features. Each user will also require a Communicator 2007 license (Communicator) for the right to use this Communications Server 2007 client-side companion software on his PC.

Each of the three Front End server machines, shown in the center, requires a Communications Server 2007 Enterprise Edition (CS EE) license because they are linked together as part of a cluster for high availability. The edge server (middle left), which provides access for external users, requires only a Communications Server 2007 Standard Edition (CS SE) license. The Archiving and Call Detail Record server (top left) does not require a Communications Server 2007 server license of any kind-Microsoft makes an exception for Communications Server 2007 servers dedicated to this specific purpose.