My Client currently has a distributed Exchange 2003 architecture and is looking to move to a hosted outsourced platform. However, 70% of their emails are internal (including massive media files). With hosted solution all these will go via the internet and there are serious challenges with cost of bandwidth to support messaging and collaboration. It also negates their existing investment in a 30Mbps VPN link but the client is unwilling to invest in the human/physical infrastructure require to fully support an on-premises solution. My question: is there a way to route internal emails within the VPN network without upgrading the existing Exchange architecture, and retain the hosted solution for routing external mail in/out of VPN network?