Here is the very short Q&A Log from Part 7 (Using Cluster Continuous Replication) of the 8 Part Exchange 2007 Labcast series. Please let me know if you have any questions.
Exchange Server 2007 Labcast Series (Part 7 of 8) Questions and Answers Log (03-21-07)
Question: Do you have to use two NICs or can all communication be done over our internal domain ip scheme?
Answer: Clustering requires 2 Nics.
Question: re 2 nics, the inside (private) lan can be crossover cable between cluster members? thanks
Answered: Yes. Most organizations do indeed do that if the two nodes are next to each other or in the same physical rack.
Question: Where are the Mailboxes physicaly stored in the Cluster?
Answer: They are stored in the directory you specify. This is usually on “local” storage controlled be each node of the CCR Cluster.