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I now see that you must use a hardware load balancer due to a Windows limitation preventing you from using Windows NLB and Clustering Services on the same Windows box. &nbsp;Alternatively, you can deploy two dedicated CAS Servers and utilize Windows NLB to load balance your RPC Client Access Server traffic.<br />
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NLB cannot be on the mailbox server ? If CAS\HUB &nbsp;Servers are seprate and &nbsp;utilize NLB can I avoid having to buy a hardware load balancer?
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I now see that you must use a hardware load balancer due to a Windows limitation preventing you from using Windows NLB and Clustering Services on the same Windows box.  Alternatively, you can deploy two dedicated CAS Servers and utilize Windows NLB to load balance your RPC Client Access Server traffic.

NLB cannot be on the mailbox server ? If CAS\HUB  Servers are seprate and  utilize NLB can I avoid having to buy a hardware load balancer?

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Yes, you can use network load balancing if your HUB/CAS servers or separate from the mailbox servers in the DAG.
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Yes, you can use network load balancing if your HUB/CAS servers or separate from the mailbox servers in the DAG.

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I support a business Exhcange 2010 environment with 2 new Exchange 2010 CASHUB/MAILBOX servers and getting prepared to setup a DAG , can someone provide details how the CAS/HUB faiils over, do I need to setup NLB?
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I support a business Exhcange 2010 environment with 2 new Exchange 2010 CASHUB/MAILBOX servers and getting prepared to setup a DAG , can someone provide details how the CAS/HUB faiils over, do I need to setup NLB?

Exchange 2010 HA for SMB

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.