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Using Exhange server in multiple sites

Hi All,
I have a windows 2003 server network, single domain, that consists of 2 sites connected by a point to point T1 wan connection.  There are already 2 DC's with GC installed in each site.  We currently have a single Exchange server in Site 1, and users from both Sites 1 and 2 connect to that server using Outlook 2003 (using cached Exchange mode, if that helps).  The users in Site #2 suffer performance issues at times due to the wan connection.  Also, because there is a only one server, there is no fault tolerance.

We want to come up a solution going forward that will allow both sites to have their own Exchange server.   The users in each site would then connect to the Exchange server in their own site.  This would (or should) eliminate the performance issues.  My plan would be to have the Site 1 server handle all email traffic in/out of our domain, as it currently does.   But ideally, I'd like to be able to reconfigure the external mail to pass through the Site 2 server if Site 1 goes down.

Next, ideally I'd like to have the two Exchange servers replicated to each other so that if either should go down, I could reconfigure our clients to connect to the server that is still running, until the site that was down is restored.  So I'd like to have an up-to-date copy of the all the user mailboxes kept in each site.

I am new to Exchange, and I trying to understand if this is
A) Possible
B) Feasible
C) If there is a better idea out there?

The main jist of this is that want to have  1) better fault tolerance and  2)better performance in Site 2 than we currently have.  I have been trying to read up on this, but am having trouble finding info matching this particular situation.  I think it would require third party software to handle the replication aspect.  I certainly would consider upgrading to Exhange 2007 if that can handle it.
Any info or suggestions you may have is greatly appreciated!!  
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ryansoto
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http://www.petri.co.il/forums/showthread.php?p=39656

https://www.experts-exchange.com/questions/23050429/Exchage-2003-second-server-installtion-for-sharing-the-load.html

About your replication question.  
Exchange doesnt do replication straight out of the box so you would need either a cluster (a second exchange machine) that works directly with the first in case one goes down or something like never fail


Another great guide about moving to new hardware or second machine
http://www.amset.info/exchange/migration.asp
https://www.experts-exchange.com/questions/22747537/Installing-Second-Exchange-2003-on-an-Existing-Domain.html
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Tekkote

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Hi, and thanks.  A lot of good info there, but I'm having trouble making it fit to my particular situation.  
To further explain, we would be installing a new machine in the second site, putting Exchange on it, and servicing the users in that site (site 2) with it.  And hopefully we can somehow provide fault tolerance to our existing server in site 1 if possible.

Anyone out there have any experience in this specific type of situation?   I am not familiar with what's is possible...
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ryansoto
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I agree with what Sembee said.

What I'd recommend is 4 servers.  2 production servers and then a DR server for each of the production servers.  Wansync is a great product for replicating exchange for DR.  I'd take a look at that.

Exchange 2007 does have some additional options - I haven't dug too deep in the replication options, so you may want to look a bit more at this.  But Wansync would work great for 2003.
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Thanks for your help and getting me pointed in the right direction!