With this yesterday’s release of the Lync 2010 Release Candidate software to the general public I’m already seeing people attempting to use the Lync client to sign-in to an existing Office Communication Server 2007 R2 server.
This is understandable as everyone wants to try out the new client and explore the new look and feel, yet deploying a Lync Server to sign-into will take some time to setup even in a lab. But it should be understood that scenario is not supported, the Lync Client only functions correctly when used with the intended Lync Server back-end.
Now this approach is no different then what was supported between the last major releases of LCS and OCS as Office Communicator clients could not sign-in to LCS servers. Although that was due to mainly the introduction of the Enhanced Presence states which LCS was not aware of. For this release it’s the basic fact that much of the new client capabilities stem from changes to the back-end server components, thus using the Lync client against and OCS 2007 R2 server will offer a pretty limited experience.
For example, it is quite common for the corporate Address Book synchronization to fail. This will happen regardless of whether the client is connected internally or externally (Via an Edge Server).
Additionally various Exchange Integration issues may be experienced, as well as possibly preventing the scheduling of Live Meetings altogether.
So, get cracking on setting up that test lab, as I’ll be following up with a step-by-step Standard Edition server deployment shortly.