Attachments in Sidebar

Hello, what exactly are the Attachments in Sidebar. The top gives the Contact details, the History does indeed give a history of e-mails with that particular contact, but what are the Attachments, they seem to be a fairly random selection of Attachments some related to that Contact, and some not. I am running the new Client 7 and was wondering about purchasing a license, but I need to know that it does work. Thanks.

On mine it shows a list of any attachments found in the emails listed in History