This update package fixes the following issues:

• The license expiration date for Office Communications Server (OCS) 2007 R2 Evaluation Edition was calculated incorrectly. This causes OCS 2007 R2 Evaluation Edition to expire on June 13, 2009. This update fixes the license expiration date calculation for the OCS 2007 R2 Evaluation Edition. By downloading this update, the expiration date will be based correctly on the installation date of the server.
• Earlier updates of OCS 2007 R2 required Microsoft Message Queuing (also known as MSMQ) to be installed on OCS 2007 R2 Enterprise Edition Distributed – Front End or the OCS 2007 R2 Standard Edition. This update removes that requirement.
• The RTC Media Relay driver in OCS Edge Server has also been updated this update.

http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=b3b02475-150c-41fa-844a-c10a517040f4