I don't know about the email icon. But for voicemail I have noticed that in the messages log that if you don't open the message indicting new voicemail it will leave the icon even if you have listened to your voicemail. To clear the icon just look for the most recent messages for voicemail in the message log and open and/or delete them. It is also possible that opening each email message may clear the messages the BB thinks have not been viewed.