A. The typical cause for receiving errors while monitoring Exchange virtual instance is that each monitored virtual instance's DNSName is blank in the Operations Manager 2007 database MT_Computer table. To resolve the errors, first run the following query to list all the servers with blank DNSName values:

Next, use the following command to set the correct name for each server with a blank DNSName value:

Then, restart each client's Operations Manager 2007 Health Service, and the errors should be gone.