Microsoft Unified Communications Voice Specialization Exam 088-924 has changed exam number to 074-924.
From the text description of the Exam, the content should have been updated to include OCS 2007 R2, however my sources says that the content is the same as the old exam (Only OCS 2007)
Exam 074-924: Microsoft Office Communications Server 2007 –Unified Communications Voice Specialization is designed to validate your skills and experience to design, deploy, and administer Microsoft Voice solutions in production, including the interoperability of Microsoft Office Communications Server 2007, Microsoft Office Communications Server 2007 Release 2, Microsoft Exchange Server 2007 – Unified Messaging, Microsoft Windows Server Active Directory, gateways, and private branch exchanges (PBXs).
This exam is available in English only. A voucher is required to take the exam
This test is for IT, Telecommunications, and Networking professionals who have experience using Office Communications Server 2007 or Office Communications Server 2007 Release 2. You should also have experience using and configuring Windows Server Active Directory and network infrastructure components that support the deployment and ongoing management of Office Communications Server 2007 versions.