Data Validation ensures that you won't create any mail-merge letters which have missing fields. It examines everyone that you will be mailing and makes sure that all the fields have been completed.

In cases where there are multiple addresses for someone, it will allow you to choose an address - if you don't then the first address in the list will be used.

Click the Start button to begin validation.
     
    Note Remember that any changes that you make are written back into the database as though you were making the changes in the main program.