My computer Operating System is Windows XP, but this may not be relevant. when using Outlook Express for emailing, a window appears asking if you would like to free up disk space by "Compacting Messages" I always click cancel. Today, my small brother was using the computer and clicked yes. For reasons I cannot understand, a large amount of messages have now been removed from my Sent Folder so please help me where these deleted mails stored in the hard disk.