From Brian Dobson:
Adding barcodes to Word can be hard, or it can be easy. This Word barcode add in elimates all the cutting and pasting of image barcodes from websites, as well as cutting and pasting from barcode fonts. In fact, this Word Barcode add in is the best of both worlds. The accuracy of a font based barcode with the ease of use of a barcode image. While you can have barcodes embedded in your text, you can also float text barcodes above your Word document and simply drag them to the location you need. This Word Barcode add in works for all versions of Word from Word 2000 through Word 2007 running on Microsoft Windows. Built on a base of the Code 128 Barcode set, the Word Barcode Add In allows encoding all the standard alphanumeric characters, as well as most punctuation. The Word Barcode Add In shifts between Code 128 variant sets, making the shortest barcodes possible for the data your encoding. It's fast, it's accurate, and it's inexpensive. I believe you would be hard pressed to find an equivalent product at this price anywhere. To install, download the Word Barcode installer. Run the installer. The code 128 barcode fonts will be added to your system font directory and the Word barcode add in file will be installed in your systems Word startup folder. You must restart your computer before the fonts will be available in Word. A number of options are available to make creation easier.