Exchange 07 deployment

I've heard of the various modes that Exchange 2007 can be configured and I was wondering if anyone can point me to the right direction as to what mode is most appropriate for this scanrio.
 I have a Server 2003 based network with Exchange 2003 on a front/back end configuration.
I have a new Server 2008 (64 Bits) server that I would like to install Exchange 2007 to begin moving users little by little. The front end server is doing OWA and is critical to the organization. One Exchange organization and one single domain.

Email comes first to a McAfee 3200 SCM appliance that scans for SPAM and then forwards to the front end server. I host multiple domain email address. I'll be happy to provide more ifnromation if needed. Thanks
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jkarnes12Connect With a Mentor Commented:
IF you only have 1 physical server to use for Exchange 2007, you will have to install the Client Access, Hub Transport and Mailbox Roles onto this one server (Not necessarily the best configuration).

Your best bet using the least amount of hardware, would be to have one physical server for Client Access/Hub Transport, and then one physical server for the Mailbox role.

Note:  In order to Migrate to an Exchange 2007 environment, the first 2007 server role you need to install will be Client Access.  

This technet library can help you manage your co-exitence and migration strategy:
menendezaAuthor Commented:
I do have a secondary server that I could use for this transition. So in this case, can I configure a 07 installation and replace my front end server with this installation (leaving the back end as 2003) and once everything is operational install the second 07 installation and move the mailboxes there? Would that be a good approach?
That would be the correct approach.  Obviously there are a few more steps than those :), but that's it ina  nutshell.  If you decide to go this route and have any questions, please let me know!
menendezaAuthor Commented:
Right, I understand about the "extra steps" Like you said this is on a nutshell. I would appreciate the extra help if it's not asking much. Any links or sites that can point me int eh right direction would be great!. Thanks!
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