Exchange Server validation fails, error in System Event log: "DCOM was unable to communicate with the computer <servername> using any of the configured protocols".
Regather structure gives error: "No such task"
1. From the MessageStats console Expand Exchange Organizations and right-click the Exchange organization and select properties.
2. Click the Connection Server tab
3. Under Advanced Properties click on "Configure"
4. Click Use Default Task Security Content
5. Click Accept
6. Validate the Exchange server and run the Regather Structure.