A double left-click will place the attachment into the proper program and allow you to directly view it. Address Books E-mail addresses are often convoluted and just downright difficult to type. You can even associate a nickname for a group of e-mail addresses. To get to the address book, from the menu bar, choose Tools and from the drop-down menu, choose Address Book. The address book will also allow you to accumulate certain convenient bits of information such in Notes or Info.
Address books are extremely handy and heavily used.