Hotmail/Outlook e-mails and folders disappeared

I woke up this morning to find my hotmail account had all empty folders (including sent and deleted). I also noticed the personal folders I created completely disappeared with all the contents. My contact list is still there. I have a second hotmail account for business and that account is fine. Does anyone have any suggestions about why this happened and how to recover the e-mails that are now missing? Thank you.