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I &nbsp;am confused how DAG in exchange 2010/2013 &nbsp;is different from CCR, LCR , SCC in exchange 2007<br />
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I believe CCR, LCR, SCC uses failover clustering while DAG doesnt
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I  am confused how DAG in exchange 2010/2013  is different from CCR, LCR , SCC in exchange 2007

I believe CCR, LCR, SCC uses failover clustering while DAG doesnt

EXCHANGE 2007 , EXCHANGE 2010

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.