why were my account not moved to Outlook.com?

I have not signed in my hotmail account for a long time because of my illness. I have a lot of important mails in it. Today I tried to sign in  hotmail but my account was empty. I saw a message like "All Hotmail customers have been upgraded to Outlook.com. Your email address and password have not changed. Also, your email, contacts, files, calendar items, and settings are all still there".  But my emails,files,contacts are not there. My inbox, folders are empty.