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you can get complete overview here <a href="http://www.microsoft.com/exchange/en-us/exchange-2007-overview.aspx" rel="ugc">http://www.microsoft.com/exchange/en-us/exchange-2007-overview.aspx</a>&nbsp;
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you can get complete overview here http://www.microsoft.com/exchange/en-us/exchange-2007-overview.aspx [http://www.microsoft.com/exchange/en-us/exchange-2007-overview.aspx] 

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For better redundancy you need server, site and disk resilency. Which you can do it with Exchange 2007 CCR and Exchange 2010 DAG only. Check below article for more understanding<br />
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<a href="http://www.exchange-genie.com/2009/04/database-availability-group-dag-exchange-2010/" rel="ugc">http://www.exchange-genie.com/2009/04/database-availability-group-dag-exchange-2010/</a>
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For better redundancy you need server, site and disk resilency. Which you can do it with Exchange 2007 CCR and Exchange 2010 DAG only. Check below article for more understanding

http://www.exchange-genie.com/2009/04/database-availability-group-dag-exchange-2010/ [http://www.exchange-genie.com/2009/04/database-availability-group-dag-exchange-2010/]

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demazter,<br />
<br />
How does exchange 2010 sync the databases? Over the network? or do you have the network/san option? Would you use a second nic for the network traffic and how does the syncing offset server resources. Wouldn't this double them?
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demazter,

How does exchange 2010 sync the databases? Over the network? or do you have the network/san option? Would you use a second nic for the network traffic and how does the syncing offset server resources. Wouldn't this double them?

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Would appriciate come help understanding creating redundancy using exchange 2007/2010. SCR vs CCR, Do I need a SAN? What about for really large networks that need lots of storage, like 20,000 users. Thanks.
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Would appriciate come help understanding creating redundancy using exchange 2007/2010. SCR vs CCR, Do I need a SAN? What about for really large networks that need lots of storage, like 20,000 users. Thanks.

Need help understanding Exchange 2007/2010 clustering

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.

Exchange

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.