Lost emails in Windows Live Mail.

This morning when I opened my email everything was fine. An hour or so ago, when I checked again,  all of my messages (inbox, sent and deleted) had disappeared. Also, every message dating back to 9/11/2013 had come back as a new/unopened message. I no longer have any of the messages I had saved in my inbox. My laptop was not affected though, but I don't save any business emails on that, so I can't retrieve any of the important ones that were saved in my inbox. The same thing happened on my husband's acct. but he received 191 new/unopened messages dating back to 9/2011.