Windows Live Mail

I have been using Windows Live Mail as my email manager.  I have my emails pulled from my online account into Windows Live Mail and set up folders, etc., to keep what I need.  Today when I went into Windows Live Mail, it said it was downloading the database and it took a LONG time to load my messages.  When it did load them, it put them ALL back in my inbox and deleted all my folders that I had set up.  It also hid my contacts.  Has anyone else had any problems like this and is there any way to reverse it?  Thank you