Hello, For some reason there have been some issues where e-mails have been deleted from some users as I have heard, you're not the only one. I believe Yahoo has been notified.. you can e-mail yahoo support [email]mail@yahoo-inc.com[/email] put in your id, dob, zip, alternate e-mail addresss and see if they can help you to retreive them.. Did you try the beta version? Make sure you're logged in under the right ID. My mom thought for a second all of her e-mails were gone, and it turned out she made an e-mail that was similar to the one she had, and low and behold there they are. So maybe sign out and sign back in, make sure the id is typed in correctly. Try deleting your temp files and cookies and maybe try a different browser.

Good Luck