In the Mail Merge Helper dialog box, click Get Data . Click Open Data Source . From the list of files, select the data source that you want to use, and then click OK . If the data source is not listed in the list of files, click the appropriate drive and folder. Then, select the appropriate option in the List Files of Type box.
Word then displays a message to set up the main document.
Click Set Up Main Document . In the Mail Merge Helper dialog box, click Get Data and select Use Address Book . The Use Address Book dialog box appears with the available address books listed under Choose Address Book . Select the address book that you want to use as your data source. Word may prompt you to confirm the data source if Confirm Conversions is selected as an option.