Video created by Scott Schnoll of Microsoft.

In Part 5 of the Blogcast, I mention that the cluster needs a "special, unique IP address." I meant to say it needs a "static, unique IP address." In order for a failover cluster to be supported, it must have at least two network interface cards (NICs) in each node. One NIC is typically dedicated to the private network traffic (e.g., cluster heartbeat traffic), and the other NIC is used for both public network traffic (e.g., client, server, and administrator interaction with the clustered mailbox server and the cluster) and private network traffic (only if the dedicated private network fails). When forming the failover cluster, be sure to follow the instructions in the Exchange Server 2007 product documentation:

-Exchange 2007 Product Documentation (Online/Web) - http://go.microsoft.com/fwlink/?LinkId=69434 

- Exchange 2007 Product Documentation (Offline/CHM) - http://go.microsoft.com/fwlink/?LinkId=69162

In Parts 5 and 6 of the Blogcast, the clustered mailbox server is installed into the cluster (first the active node, then the passive node). Be aware that any pre-requisite checks that fail when installing the clustered mailbox server are not re-checked on the passive. It is very important that you ensure that the passive node meets all pre-requisites, too.