Your sales history for a particular customer can be easily accessed via the Address Book.
Use the Accounts Summary link to see a detailed history.
You can also access the Accounts Summary via a Sales order.
From here, you can search for additional Sales Orders within a date range or Sale Type or a particular status. There is a Reports button that will navigate you to the Sales Order reports using the same search criteria. You can also print or reprint invoices using the Print Invoice button.