resetting Blackbery screen

I have a Curve - the main window shows summaries of messages and when you roll over Yahoo or Gmail or whatever, it tells you how many unread messages you have. I've had it about a month now, and it's currently showing that I have one unread message in my yahoo account and one in my second email account, however, I have read all messages. The little envelope icon at the top that summarizes ALL unread messages says I have 6 of them. I don't. Is there a way to reset all that so it's right?

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BlackBerry