Exchange Failover Cluster

We have Exchange 2007 running on a Windows Server 2003 x64 box. I would like to implement Cluster Continuous Replication (CCR). I would like to build another Exchange 2007 server running on Windows Server 2008 x64. I know that Standby Continuous Replication (SCR) requires that the source and target nodes be running the same OS but as far as I know in CCR this in not the case. My question is can I just install the 'Passive Clustered Mailbox role' on the new Windows Server 2008 box? Are there any configuration changes that need to be made on our Active Exchange Server to allow it to replicate? The two Exchange nodes are in the same domain but in different sites. We are also utilizing the Edge Transport Server Role in our Active Exchange setup. If there is another type of replication that you think is better I am open to suggestions. My main goal is to setup a failover server for disaster recovery.
kpurchaseAsked:
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
You will have to setup geographically dispersed clustering if they are in different sites.

There is a lot out there about it...here is one article:  http://msexchangeteam.com/archive/2007/04/25/438185.aspx
 
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kpurchaseAuthor Commented:
This article that you have referenced states that the nodes cannot be in different subnets. The nodes are in different subnets because they are in two different sites. Also the replication has to be able to replicate from WIndows Server 2003 to Windows Server 2008,  that's what I can't find anywhere. Any other suggestions.
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
Ugh...Sorry about that...I read the 2003 and a 2008....you are out of luck...both servers need to be at 2008 enterprise or 2003...clustering does not work between the two OS's.
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kpurchaseAuthor Commented:
Ok that's what I figured. What I really want to do is test Restoring the Mailbox database backups. If I build another Exchange Server and test Restoring the backups that will not affect the Active Exchange server, correct? I will build it in the same domain but in a different site.
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
Correct you will not affect the other exchange server.    I recommend getting backup exec to do the backups.   I have worked with it for a while and it does the grandular restore...so you can backup the mailbox database then restore an individual email if needed.     This makes it a bit easier then settings up a recovery database.
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kpurchaseAuthor Commented:
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