Exchange 2010 Topology

Hello,

I wonder if someone could give me some advice.

I'm setting up an Exchange 2010 infrastructure, and am in the lucky situation of having four Exchange servers.  My company has a single domain and one site.  Two of the servers are running the Hub Transport and Mailbox roles, and I have created a DAG.  I was intending to run the Client Access Server roles on these servers but as I can't use Windows Load Balancing because a DAG exists, I am now going to be setting up the Client Access Server roles on two new servers.  My question is whether it is best to run the Hub Transport roles on the two original servers, or whether it is best to move those roles to the new servers.  The original servers are running Windows Server 2008 R2 Enterprise and the two new servers are running Windows Server 2008 R2 Standard.

Any guidance would be appreciated.
vphulAsked:
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Hendrik WieseInformation Security ManagerCommented:
Industry standard and best practice in my opinion would be to setup your environment as follow:

2 x Servers hosting the Mailbox role so you can setup DAG
2 x Servers hosting the CAS and Hub roles so you can setup the CAS Array

This way you would have redundancy on both your CAS and Mailbox server.

Hope this helps!!!

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vphulAuthor Commented:
Thanks Hendrik for your advice.
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