Could it be that the option to show only unread mails in the inbox is set?
In Win Live Mail, this morning when I forwarded an incoming message with 6 photos in it to a colleague it disappeared from my inbox and was only retreivable from within the "sent" folder in the message I forwarded it in. In effect my original mesage was lost, except for it being in my "sent" folder. Wow, difficult problem if it continues. It's happened several times lately. Is some setting wrong? Thanks.