Also, is it possible for the new Exchange 2003 server to replicate with our other Exchange 2003 server (which resides in a remote location) through the VPN on an active/active cluster?
At times, I've seen architectural firms using Exchange Server to email 300 MB design documents. I've also seen Exchange used for average email traffic that's less than 10 KB. Microsoft can help you calculate some rough estimates based on their predefined user profiles:
To answer your second question, Exchange Server 2007 is a platform you may want to consider looking at. I know more enhancements are coming with Exchange 2007 Service Pack 1 (SP1), but here are some of the features it currently has:
Both Local Continuous Replication (LCR) and Cluster Continuous Replication (CCR) may provide the type of resiliency you are looking for.
Do you have comments on this Ask the Expert Q&A? Let us know.
Related information from SearchExchange.com:
This was first published in October 2007