Best Practices Microsoft Exchange Multi Site Deployments

Hi,

We are evaluating a Microsoft Exchange Deployment.
We have 5 offices every where in the world. The main office is in Toronto. (Windows 2003 everywhere)

All of them, the network is totally independant. We plan to install permanent VPN between offices. The biggest issue is Exchange.
In a short description, we try to figure out the best pratice to deploy Microsoft Exchange in all of our sites. We are open to start from scratch a couple of sites.

Should we : Create one domain and Deploy Exchange in a server in every site and deploy a Front End server to redirect the mail to each site.

Should we : Create a Forest trust in EverySite and Deploy Exchange... (I'm not sure of this one.)

Any suggestions how we can proceed ?
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bmdgiAsked:
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isaman07Commented:
Well it will depend on how you are planing your active directory, will there be child domains in the remote sites or it will be one domain throughout the sites? How many users total? etc,etc.
Personaly, i wouldn't complicate it. I would create one domain with a DC(global catalog) in every site, one or more exchange servers at the main site (you can have the front end backend configuration at the main site). Users from the remote sites can log on the exchange server through the VPN or you can configure your exchange for RPC/HTTPS proxy. This will require minimum administration.
Ofcourse, it's your call depending on your needs and number of users and IT staff.
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