Standby Continuous Replication (SCR) in Exchange 2007 SP1
One of the best, and most talked about, capabilities coming in Exchange 2007 SP1 is Standby Continuous Replication or SCR.
This features allows you to have a standby Exchange server for DR/BCP purposes, in addition to your CCR cluster for HA - in different datacentres of course :)
So by having three servers - with no specialised/expensive replication or storage requirements - you can now have a full high-availability (CCR) and disaster recovery (SCR) plan for your Exchange messaging and voicemail platform.
A great post on SCR has just been published at https://msexchangeteam.com/archive/2007/06/28/445538.aspx