How to use the Mail Merge feature in Word to create and to ... In Microsoft Office Word 2003 and in earlier versions of Word, point to Letters and Mailings on the Tools menu, and then click Mail Merge Wizard. In Microsoft Office Word 2007, click Start Mail Merge in the Start Mail Merge group on the Mailings tab, and then click Step by Step by Mail Merge Wizard. Under Select document type, click Letters.