Microsoft and Nortel has announced a joint roadmap for Voice over IP and Unified Communications and it indeed looks very interesting. Here's a short summary -
UC Integrated Branch. This new product from the alliance will incorporate Nortel and Microsoft® technology on a single piece of hardware that delivers cost-effective, high-quality and easy-to-deploy VoIP and unified communications in remote offices. The UC Integrated Branch is planned to be available in the fourth quarter of 2007.
Unified Messaging. To simplify customer deployments, native session initiation protocol (SIP) interoperability between the Nortel Communication Server 1000 and Microsoft Exchange Server 2007 Unified Messaging is planned to be available in the second quarter of 2007. The solution includes Nortel professional services for design, deployment and support.
Conferencing. This new solution will extend the rich feature set of Nortel Multimedia Conferencing to Microsoft Office Communicator 2007, delivering a single, familiar client experience consistent across applications such as voice, instant messaging, presence, and audio- and videoconferencing. The on-premise solution is planned to be available in the fourth quarter of 2007.
In 2007, the companies also plan to extend their current unified communications solution — a unified desktop and soft phone for VoIP, e-mail, instant messaging and presence — to the Nortel Communication Server 2100, a carrier-grade enterprise telephony product supporting up to 200,000 users on a single system. "
You can read the full transcript and see the webcast here.