Oops, I appear to have done something foolish.  I sign into outlook.com and all MS services using *** Email address is removed for privacy ***, not @outlook.com. I was messing around on Windows Live Admin Center and added the private domain ngc1952.dot.com, which didn't exist before.  Then I deleted it.  The next time I tried to log into the outlook.com web interface, it set up a completely new empty mailbox. All of my email messages and folders are gone.

I also use MS Outlook, and was able to disconnect from the internet and copy all the messages into a new PST before they got synched out of existence.  But is there any way to recover the email data stored in the cloud or is it gone forever?