I read about this kb on the Office Communications Server Team Blog (http://communicationsserverteam.com) and the following kb http://support.microsoft.com/kb/968802 has a descriptive list of all updates for OCS 2007 R2 and its use for each server role.
About The Author
Anderson Patricio is a Canadian MVP in Cloud and Datacenter Management, and Office Server and Services, besides of the Microsoft Award he also holds a Solutions Master (MCSM) in Exchange, CISSP and several other certifications. Anderson contributes to the Microsoft Community with articles, tutorials, blog posts, twitter, forums and book reviews. He is a regular contributor here at Techgenix.com, MSExchange.org, ITPROCentral.com and Anderson Patricio.org (Portuguese).