@Julie
I’ve managed to recover deleted messages in your account. They are now in your inbox. Please check them.
I’ve checked your account and it appears that you are automatically accessing your account in Windows Live Hotmail. While we cannot confirm if your messages were manually deleted or not, we suggest that you do not select this option if you are using public computers.
Note: Please click the “Sign out” link on the upper right corner of Windows Live Hotmail page if you would like to stop the automatic sign in process in particular computer.
I also suggest that you strengthen the security of your account. To do that, please check the links below:
http://windowslivehelp.com/solutions/supportmgr/archive/2009/04/08/please-enter-your-password-more-than-a-passing-decision.aspx
http://windowslivehelp.com/solutions/safety/archive/2008/10/24/protecting-your-identity-you-can-t-afford-to-take-the-back-seat.aspx