When users go to Addressbook in GroupWise 7.0 and hover over a user, the following error pop up on the GroupWise Messenger 2.0 Messaging Agent console:

13:35:57 211 SPL Request (Get Other Status) [0xB106]: CN=jdoe,OU=Users,O=orgz- Host is unknown to system

This seems to be a problem with Messenger presence recognition. How do I fix this?