Outlook for Mac 2011 with an Exchange Server

I have folders in my inbox with subfolders.  

One of these folders opened in a new window, not sure why.  I closed that window and the folder started to disappear out of my inbox.  It is not in the deleted folder or moved to any other folder in Outlook.  Any thoughts on recovering this?  No Time Machine backup, asked IT to restore, hopefully they can.

Thanks.