I have two unity box's one 4.x and the other 7.x. A complete rebuild of the VM was needed as client was not happy with current setup so not dirt or cobra. They still use the same exchange server for delivery.
When I create the new user in 7.x it marks all the VM as unread and the only way i found how to fix it is to go into the system via the phone and delete them that way. Is there a better way ?