This update package fixes the following issues:

• The license expiration date for Office Communicator (OC) 2007 R2 Evaluation Edition was calculated incorrectly. This causes OC 2007 R2 Evaluation Edition to expire on June 13, 2009. This update fixes the license expiration date calculation for the OC 2007 R2 Evaluation Edition. By downloading this update, the expiration date will be based correctly on the installation date of the OC 2007 R2.

http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=515d6dba-4c6a-48bb-a06a-d99c5742676d