Seems like after installing the update (12" G4 Powerbook, OS X 10.4.3), Mail isn't showing New Messages from certain accounts (though it still seems to be receiving New Messages for all accounts and indeed, showing received New Messages for some accounts). Sending e-mail seems to be okay. I've tried to repair permissions since the problems started (although I didn't repair permissions before the install); is that too little, too late?

Any help would be useful. Thanks in advance.