Microsoft published two new knowledge base articles for System Center Virtual Machine Manager 2008. KB976640 - How to troubleshoot the "Not Responding" host status in VMM 2008 – discusses steps to help you troubleshoot a status of "Not Responding" that may appear in the Administrator Console. And KB976639 - The Virtual Machine Manager Service crashes when you add a virtual machine host that has more than 16 logical processors in VMM 2008 R2 – discusses an issue where the Virtual Machine Manager Service may crash when you add a virtual machine host that has more than 16 logical processors.