This is an inform post related to the Cluster MP. The update to the management pack was released in April, and had some issues due to needing an unreleased QFE for the WMI support in the Cluster software.
The QFE for Clustering that impacts detecting exchange clusters and other WMI issues in clusters has been released.
http://support.microsoft.com/default.aspx/kb/958807Regards
Dan
Microsoft Corporation