A Mac storage error came up while I was in outlook, saying I ran out of space, and next thing I know outlook deleted my entire account...

I can also not load the account back onto outlook. All of my emails and stuff are in my mac finder but says the identity is not assigned. I can't find the identity to that account. Or I am just not doing something right. I am not sure if it's gone/hidden/etc.  I am not very tech savvy so I hope ya'll can help. 

If someone could please dumb this very down for me and help me fix it that would be great!