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.