I have been asked several times recently about the BlackBerry® client support for OCS R2 (RIM makes a BlackBerry client that works with OCS. You can read more about it in my original post: Mobile Options for OCS).
The short answer is that OCS R2 is not supported, however there is a workaround that amounts to [...]
With mobile device usage (including phones) becoming the de-facto communication device, extending the reach of Office Communications Server 2007 to information users on their mobile devices is powerful.
Below I summarize the available options for many popular devices.
Blackberry
If you are running a Blackberry Device with software v4.1 or higher, and BES Server v4.1 with Service Pack [...]