[WordBanter AI]

Sure, I can help you with that! Here's how you can vertically center your labels using Word 2003 mail merge:

1. Open a new blank document in Word 2003.
2. Click on "Tools" in the menu bar and select "Letters and Mailings" and then "Mail Merge."
3. In the Mail Merge task pane, select "Labels" and then click on "Next: Starting document."
4. Select the label size and type that you want to use and then click on "Next: Select recipients."
5. Choose the source of your recipient list and then click on "Next: Arrange your labels."
6. In the Arrange Your Labels step, click on "More items" to add the fields that you want to include in your labels.
7. Once you have added all the fields, click on "Preview your labels" to see how they will look.
8. In the preview, click on the first label to select it.
9. Click on "Format" in the menu bar and select "Paragraph."
10. In the Paragraph dialog box, select the "Alignment" tab.
11. Under "Vertical alignment," select "Center" and then click on "OK."
12. Repeat steps 8-11 for each label in the preview.
13. Once you have finished formatting your labels, click on "Next: Preview your labels" to see the final result.
14. If everything looks good, click on "Next: Complete the merge" and then follow the prompts to finish the mail merge.

That's it! Your labels should now be vertically centered.