A good friend of mine went ahead and updated from Win 7 to win 10 without backing up anything (despite my objections) and now has windows live mail but any of his old email messages are gone. I would suspect they are in the windows. Old folder in .app but not sure. Does windows 10 store the emails in the .app file like win 7? I haven't gone over to help him yet. I am using Win 7 and will upgrade once I know that everything is working with 10.