Exchange Server 2003 Cluster Deployments: Best Practiceshttp://msmvps.com/blogs/exchange/archive/2005/05/19/47895.aspxScott Schnoll is a Jedi Master when it comes to Clustering and Exchange, he has written a number of books on Exchange and you can now watch his ITForum presentation on Exchange Cluster Deployment: Best Practices: http://www.microsoft.com/uk/technet/itsshowtimeenCommunityServer 2008.5 SP2 (Build: 40407.4157)