Redundant exchange server

Goal: make a redundant exchange server, if my main exchange server is down the 2nt server will take over.  
Our current environment.
Mail flows into a mail foundry virus/spam device them flows to a single exchange 2010 ENT server.

Question: is there an easy to bring a new exchange server into the mix and make it sync with the current one as a backup?
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Exchange server 2010 handles clustering very well you should be able to get another ENT and install it as the passive clustered server. You may need to switch the mode of the current exchange server to active since it is already installed.
James HIT DirectorCommented:
FYI... for the DAG to work it is not the Exchange server version that is the issue.
You will need to have two Windows 2008 Enterprise servers to cluster them together.
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