There are many available options. The simplest way to see all attachments sent by someone is to use the People Pane in Outlook. Just go to View tab and activate the People Pane. The most convenient option is Minimized.
Whenever you open any mail, Minimized People pane is appears at the bottom of the message. You will see a visual list of all the people addressed in that mail – sender, To and CCs. If available, their photo will also be shown. The tooltip which appears on mouse hover shows the name of the person.
How to see all attachments sent by someone
Just click on the name in People Pane. The pane opens up and shows many things – mails from, attachments sent by and meetings with the selected person.
That’s it. If you have activated the Social Connector, you can even see their Facebook and LinkedIn feed. Enjoy.