Best Setup for second Office

I have a server at site A that is SBS 2003 and Exchange 2003, which handles email for 2 domain names A.com and B.com.

The users at site A use both email domains regularly (Using SmartReply and Choosefrom to send as the B.com email addresses)  and up until now there have been 2 PCs in a remote office that use only the B.com email addresses.

The remote office is now growing and there is a need for a server. This, of course will be 2008 Server R2 with Exchange 2007.
What I need to do is set up site B with the B.com email addresses while leaving site A the ability to send and receive emails from both A.com and B.com.

I have a few ideas for configuring this, but there is a wealth of knowledge here that I would be foolish not to ask.

Does anyone have any input on how best I could impliment this?
JunoSoftwareAsked:
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btdownloads7Connect With a Mentor Commented:
Well, I didn't exactly understand your question. The original 2003 server is a Domain Controller, and can only be managing one domain, not two. So, I assume that you are only talking about two separate email domains. There is a huge difference between the two concepts, and you basically have to decide if you want to share files and resources between the two servers, in which case you'll need to make them part of the same Active Directory forest.

Having the 2007 server join the 2003 domain is a pretty complicated process, but is necessary if you plan on growing the network later and adding more servers. You basically have to transfer the main exchange server role to the 2007 server and then remove the exchange server from the original SBS server. Here is a vey detailed guide on how to do it:
http://www.msexchange.org/tutorials/Installing-Exchange-2007-Small-Business-Server-2003-domain-Part1.html

Or you can make them totally separate. You can make each of them a DC of independent domains, and then just transfer the mailboxes for B.com domain onto the new server. This way is way easier, but the two servers will basically be cut off from each other and act as independent entities.
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ZombieAutopsyConnect With a Mentor Commented:
Why not just feed site B from site A using a VPN tunnel if not already connect with one.
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JunoSoftwareAuthor Commented:
Thank you.

I was talking about email domains, although I had considered putting the server on a seperate AD domain but in the interests of sharing resources.  There is a good VPN tunnel between the 2 sites.

In the interests of keeping things simple, is there any reason to have Exchange on the Site B server at all?  The PCs that are there now use the site A Exchange server.  Presumably putting Active Directory on the site B server and using site A's Exchange would work.
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btdownloads7Commented:
Well, you said that the 2nd server will be running 2008 Server R2 with Exchange 2007, so are you or aren't you puttin Exchange on the 2nd server? And you can't have exchange without AD, so the AD will stay on the 1st server as long as exchange stays there.
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JunoSoftwareAuthor Commented:
The porpose of my post was to see if my intentions were the best solution.  In view of your previous comment I changed my mind about putting Exchange on the 2nd server.

Thank you for your input on this.
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