We have 6 sites in our company, at HQ we have 10 servers all running windows 2003 and 1 exchange server 2003. HQ runs about 75 really heavy email users, email is the main app of the company. We have vpn tunnels setup to the other sites via dsl links and these sites have DC/GC each. These other sites are currently running no email apps but we would like to host all mail on the central exchange server. We expect the other sites to be equally heavy email users but the most users per remote sites will be 15 max. The dsl links range from 2mb down to 8mb down but all have 512mb up.
Whats peoples experience of consolidating exchange services to HQ? I mean what if a user at site2 sends a 7MB email to 10 "internal users" all in different sites what way is that mail routed? does it all have to come down the 512mb tunnel to HQ ad then back out?