My private folders in outlook.com have disappeared

I posted this issue already.  I received a reply that I had a private message, and that my thread had been closed.  I went to my private messages and was asked for my account information.  I provided my account information -- and then -- nothing -- never heard from anyone again.  SO, I am starting again from scratch.  Like MULTIPLE people on this site with the same exact problem, I have lost all of my personal folders in outlook.com.  The only folders I now have are the default folders of Inbox, Junk, Sent, Drafts and Deleted.  I have obviously also lost the hundreds of emails that I stored in those files over the years.  Can someone PLEASE HELP???  I see this same problem posted all over this site, but I have not read one answer or solution to the problem.  Please, please help me.  Thank you very much.