We're preparing for a transition to Exchange 2010. Currently we have a front-end / Back-end setup at two physical locations. Our 2010 setup will be placed at our colo site and all locations will have their mail stored at that location. We have a scalable MPLS network internally, so bandwidth and throughput are not a concern. Current mail statistics are as follows:
Average size: 300MB
Growth rate: 20 mailboxes / month
With the current size and expected growth, would you recommend an all-in-one setup or splitting the roles onto seperate physical servers? Whether we split the roles or not, we plan on using a DAG, but no site-resiliency at this point. I look forward to your design considerations.