When this happens, the folder may seem lost but was just stored as a sub-folder. If you try to drag and drop files, a folder may have been moved under another folder. Scenario 1: Folder Lost During Dragging and Dropping There are many situations that this can happen, below we'll list out the most probable scenarios and solutions to find and recover lost folder in Outlook.
If you've got lots of folders in MS Outlook, it is possible that you mistakenly moved a folder to another location hence you are unable to find it. Part 2: How to Recover Lost Folder in Outlook?
Part 1: How to Find Lost Folders in Outlook?