Installing DAG into an existing Windows 2008 R2 Server Standard / Exchange 2010 environment

Currently have the following environment

5 Windows 2008 R2 Standard servers with Exchange 2010 server standard

We want to install a DAG for these servers in a remote datacenter.

Has anyone had experience installing a DAG to an existing Exchange environment like this?  I have read that adding Windows Clustering to an existing Windows 2008 R2 server with Exchange installed can cause many problems.

Is this the case?
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You cant install clustering on a 2008r2 standard.  needs to be enterprise.

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