If you do not see any messages in your inbox, try going to your SMS inbox, and your MMS inbox if you have them separated from your Emails. If that doesn't work, try a battery pull.
Posted from my CrackBerry at wapforums.crackberry.com
Go to your messages folder. Highlight today's date. Press the blackberry key (with the dots on it). Select "mark prior opened". If there's an email hiding in there, it will get opened.