Install Exchange 2010 on existing Windows 2003 AD environment

Current Environment
Our environment consists of a windows network with two Windows 2003 Domain 32 bit  and one Windows 2003 Domain 64bit controllers.  There is only one Exchange Server and it is an Exchange 2003 32 bit version.  We have acquired a new server with Windows 2008 64 bit to host a second exchange server.

Objective
As a Disaster/Recovery plan, we want to introduce a second Exchange Server on the network and share the email accounts to do load balancing.

 When we attempted to install  Exchange 2003 to the new Windows 2008 64-bit server before upgrading to Exchange 2010 as a safer option, it failed;  It seems that Exchange 2003 cannot be installed on Windows 2008 64 bit server.

The questions are:
If we have to install Exchange 2010 on the new windows 2008 server, Can it coexist with our Exchange 2003 server and in a Windows 2003 domain?   If so, what would be the sequence of steps to achieve this?
If NO!!, what would be the best upgrade path.  Would we have to also upgrade the Windows 2003 domain?

thanks
CBBNet AdminAsked:
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Adam BrownConnect With a Mentor Sr Solutions ArchitectCommented:
Personally, I would plan for upgrading to Exchange 2010. 2003 and 2010 can coexist, but it's a little screwy because of the differences they both have in the way they handle things. http://technet.microsoft.com/en-us/library/aa998186.aspx has a lot of good information on both Coexistence and upgrading. There's a lot to it, but that should give you a good idea of how to proceed.
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Adam BrownSr Solutions ArchitectCommented:
Also, it should be noted that there isn't really a good way to load balance between Exchange 2010 and Exchange 2003. They both use completely different replication techniques for High Availability. The best you can do is move some of your mailboxes to the 2010 server and keep others on the 2003 server. To get full high availability with 2010 you have to utilize two Exchange 2010 servers and a load balancer for client access at a minimum utilizing a Database Availability Group (DAG).
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CBBNet AdminAuthor Commented:
So what do you recommend?? To install a new exchange 2010 and move the mailboxes to this server from the exchange 2003 and then retire this 2003 server???
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Adam BrownSr Solutions ArchitectCommented:
That's probably your best bet if you have enough hardware to get the job done.
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