You can still insert barcode fields manually - in fact, if you have an
existing document that contains one that works, I'd copy/paste it into your
Word 2007 document. If you need further info on the exact format of a
BARCODE field, search this group using Google groups.
The problem with the barcodes inserted by Word is not just to do with the
fact that you can't use this software to get bulk discounts. It's also to do
with the fact that for multi-unit addresses (apartment blocks etc.) the
geenrated barcodes may be incorrect because the USPS changed the algorithm
several years ago and Word did not keep up. In other words, your mail might
not be handled correctly by the USPS. I am told that barcodes generated from
9-digit ZIP codes are correct, but have no means of verifying that that is
still correct.