Hello.
Yet yesterday I used e-mail ***@rpgman.ru, but today it disappeared.
Now I can't log in to this very important to me account and getting
"You're currently signed in with an Office 365 email account, which can't be used with Outlook.com"

message when I try to do it.

But I even don't know what Office 365 is and, obviously not used it)

So I need to have a way to check it AND, if possible, to attach that account (with all the mail in it) to my new account which i have just registered.