We're currently preparing a new AD domain which will be most probably Server 2008 based in which we'll install a new Exchange 2007 installation. The domain will span across 5-6 countries. The idea is that -although we have good VPN international connections - we'd have all roles installed in each country so that users would always connect locally. It will be one forest, one domain organization (other MS and non-MS services have huge problems with inter-domain functionalities) and multiple AD sites will be established.- HUB and CAS servers will probably reside on virtual servers and be responsible to inter-exchange of emails inside the organization as well as take care of Exchange Everywhere and ActiveSync connections- EDGE servers will be deployed in every country in local DMZ zones- Mailbox roles would also be installed locally (preferrably CCR clustered) and local mailboxes would be placed there in order to minimize VPN trafficIs this the way it can (should) be installed? Is such a configuration supported and possible? I've been looking around for some more deployment scenarios but couldn't find anything like this.Regards,Luka

Hi,Design may vary depending on the requirement. Below 1. Have MultipleEDGE server in Centralized location at DMZ for Incomming and Outgoing mails2. Have EDGE serves in all other location at DMZ for sending Outgoing mails3. Configure MX records point to EDGE servers at the Centralized location4. InstallHUB, CAS, MAILBOX in Each Site(Multiple servers for Loadbalance and HA)http://technet.microsoft.com/en-us/magazine/2007.10.edge.aspxhttp://msexchangeteam.com/archive/2007/09/04/446918.aspxRegards,Krishnahttp://smtpport25.wordpress.com/

So in short we are talking here about Deployment of Large Exchange organization Every site shhould have minimum GC/CAS/HT/MBX Read below deployment http://technet.microsoft.com/en-us/library/bb123567.aspx Vinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|

Thanks guys! I'm about to get 3 brand new ESX servers which I can use for test purposes so I'll emulate the multi-site installation as you proposed.Regards,Luka