My question is, I'd like my actual cluster to have 4 servers. The virtual server that will be running SQL 2005 will only be installed on 2 of those nodes. Will this work or do I have to split my cluster in to 2 to meet the SQL Server 2005 2 node failover limitation? A basic config for the cluster would be like below.... ClusterSQLNode ...Active SQL 2005 Server ClusterExchNode ...Active Exchange Server ClusterAppNode ...Active Application Server ClusterFailoverNode ...Failover SQL 2005 ...Failover Exchange ...Failover Application Will SQL 2005 install in a 4 server cluster if I only install it on to two of the nodes? Any potential gotchas?