EDIT 6/3/2009: This post is outdated. For later update on this subject, please read this.
SCCP 2007 provides the IT professional with the guidance required to plan new deployments of Exchange Server 2007 and Operations Manager 2007 in the most efficient manner, while also delivering "what-if" analysis to optimize existing implementations. At this point the results are based on models that are not fully complete so the predictions should not be used as guidance as they currently will not represent real world deployments accurately. That said, the SCCP team really needs feedback as to whether the scenarios and scale supported in the product will meet the needs of Exchange 2007 and Operations Manager 2007 customers. To sign up for the beta, please go to the connect site at: http://connect.microsoft.com/systemcenter/
What's new in SCCP 2007?
Plan for new server roles in Exchange 2007
Select how you'll cluster Exchange servers
Add in background load for virus scanning
Model 64-bit processors
Model untrusted agents and gateway servers for Operations Manager