Well, kind of.
The newly released “Running Microsoft Office Communications Server 2007 R2 in a Virtualized Topology” whitepaper goes through what is, and what isn’t supported, along with recommendations, best practices, test cases and so on. In a nutshell:
We are introducing support for both a fully distributed virtualised topology across several hypervisors and for a single server virtualised topology. These topologies are supported on Windows Server 2008 Hyper-V and any Server Virtualisation Validation Program (SVVP) certified partner solution.
What is supported?
The following server roles can be deployed
The virtual machines must be running on Windows Server 2008 64-bit. Archiving Server and Monitoring Server can be connected to a virtualised Enterprise pool, but they must run on a physical server. The fully virtualised distributed topology has been tested to handle up to 40,000 users, including 10,000 group chat users. Virtualisation of the other workloads is not supported because of possible quality issues with real-time media.
Specifically, voice, video, live meeting and desktop sharing workloads cannot be part of the virtualised deployment. Therefore audio/video/web conferencing servers, audio/video/web edge conferencing servers, dial-in conferencing, Communicator Web Access, enterprise voice, or Remote Call Control may not be deployed as part of the virtualised pool.
If any one of these workloads is required, a new pool with physical servers must be deployed for those users. For more information about support for client virtualization technologies, please refer to the official support statement at: http://support.microsoft.com/kb/951152.
In order to plan both their physical and virtualised topologies, customers can use Microsoft Office Communications Server 2007 R2 Capacity Planning Tool, which can simulate user load for the available workloads. This will help customers validating the hypervisor load and scalability before going to production”
The document, (link at the top) is a good 40 pages plus, so definitely detailed, and if you’re thinking about virtualising OCS, at least now it’s not a straight “No” in terms of support, with a number of the roles being fully supported and tested in virtual environments. I’m sure the others will become supported further down the line, but this is a great starter for 10.