E-mails lost..HELP?

[FlintTony]

My computer was acting stupid. It was stuck, nothing would work. I think the technical term is "froze up". I had my outlook express open at the time. I held down the power button until it shut the computer off. I forced the stinkin thing to shut off. When I restarted it, all of my inbox e-mails were gone. Poof...all gone. I can't find them. Any clues as to where they went? Any instructions how to get them back? Thanks.