http://www.cisco.com.ru/en/US/docs/voice_ip_comm/cucme/pbx/interop/notes/617030nt.pdf

The above document describes feature interoperability and documents the steps and configurations necessary for Cisco Unified Communication Manager (CUCM) 6.0(1) and Cisco Unified Presence (CUP) 6.0(1) to interoperate with Microsoft Office Communication Server (OCS) 2007 Enterprise Edition. These features include Microsoft Office Communicator (MOC) features, Desktop (DTP) or IP Phone features, Cisco Unified Communication Manager (CUCM) administration, configuration and provisioning and CUP device identification. It aims to provide a good understanding of what works and what does not work in terms of the feature interaction between various components of the CUCM, CUP and OCS. It also provides guidance to deployment participants of the limitations, expected behaviors as well as known issues. Please note that this document does not address performance and scalability, which are part of broader criteria for a deployment-ready solution.