Outlook - Mail Merge

Mail merge is all about mass mailings that you individualize for each recipient. You can add individual elements to any part of a label, letter, envelope, or email, from the greeting to the entire document, even images. You start with a main document, attach a list of recipient information, and add mail merge fields. Then Word automatically fills in the fields with recipient information and generates all the individual documents.

Click below to see how a Mail Merge is done: 

Microsoft Office Mail Merge