Queries retrieve messages that match criteria at the time they're run. Since new messages come into the database independently of the user interface, it is possible to explicitly run again the query and have those new messages added to the current list. This is done with the Selection->Refresh command or the F5 key. Note that messages in the current list that no longer match the query are not removed from the list.

Built-in selections "New->All" and "Current->All" can also be automatically and periodically refreshed based on the "Automatically refresh results" and "Auto-incoporate new messages into lists" settings in the preferences (Section 7, “Fetching”).