So you just made a keyword search in Outlook and found that very important email from your boss. Awesome! But how can I find the path of that email, you may ask? Here is a very quick tip.
By hitting ALT+ENTER on the corresponding email, you can see some properties, including the email's folder. In my case it is Posta in Arrivo (Inbox).
Another way of finding out, is to double-click on the email and select File on the top left of the window.