Exchange 2010 DAG/Cluster issues after outage

We are running an Exchange 2010 environment.
We have a DAG made up of 2 Exchange servers and a witness server.

Our ISP had an outage that lasted more than 12 hours

After the outage the DAG/Cluster was down. The Exchange servers were rebooted. Windows updates were applied. Cluster Manager can't connect to the cluster after reboot...from either node.

How do we create a new cluster, associate it with the existing DAG and add existing servers without losing anything from the data stores.
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John ChristopherAnalystCommented:

Although it would look like we need to start all over again as a new cluster association with the existing DAG, you might need to go to the cluster resource properties and identify the appropriate DAG ip.

further you can follow the this link and let me know if that works for you.

Thanks & Regards
John christopher.

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