The barcode produced by Word is POSTNET.
The USPS no longer accepts that format for bulk mail discounts -- see
http://support.microsoft.com/kb/897290. You might as well not use the
barcode feature at all.

Signature
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Graham Mayor - Word MVP
My web site www.gmayor.com
Word MVP web site http://word.mvps.org
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> This was an option in Word 2003 under Letters and Mailings, Envelopes and
> Labels.