I frequently do a mailbox wide search in Outlook. Sometimes, it is important to find out where exactly that email is located in Outlook. The search results list doesn't indicate the folder, unfortunately.
Solution 1 (reveals the folder name, but not the sub-folder structure):
If only the name of the folder is important to you, you can determine this by opening the “classic” Properties dialog of a message via the keyboard shortcut ALT+ENTER. This works for an email that you have selected in the Search Results list but also for a message which you’ve opened via a double click. The folder name can be found under "Location".
Solution 2 (reveals the folder name and sub-folder structure):
Double click on the message to open it in its own window. Open the Advanced Find feature via the keyboard shortcut CTRL+SHIFT+F. The “Look in” field will reveal the folder name to you and clicking on the Browse… button will show you the full folder hierarchy.