Use Mail Merge to Create and Print Letters and Other Documents
One uses mail merge when one wants to create a set of documents, such as a form letter that is sent to many customers or a sheet of address labels. Each letter or label has the same kind of information, yet the content is unique. For example, in letters to the customers, each letter can be personalized to address each customer by name. The unique information in each letter or label comes from entries in a data source.