http://www.dell.com/downloads/global/power/Dell_ExchSP1_W2K8.pdf
http://www.dell.com/content/topics/global.aspx/sitelets/solutions/messaging/exchange_2007_resources?c=us&l=en&cs=555
Standby Continuous Replication
http://technet.microsoft.com/en-us/library/bb676502.aspx
http://technet.microsoft.com/en-us/library/bb691321.aspx
http://technet.microsoft.com/en-us/library/bb738150.aspx