I was rather surprised to see the error message below while uninstalling Exchange 2010 in my test lab.
The server in question was a member of a DAG, but it had been removed from the DAG gracefully and the DAG was deleted as well. There is no reference to the DAG while I checked the AD configuration using ADSIEdit. There was no cluster in the Failover Cluster Manager as well.
Cleaning up the node from the command line helped Exchange recognize that it is not part of a DAG. The command is cluster.exe node /force.
Retrying the uninstall came back with all green tick boxes.
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