Re: Microsoft Office Word 2007-Envelopes, E postage properties option
It seems like E-Postage is a paid service to add postage to your envelope. I would agree you probably need to install some utility to do that.
If you just want to add a bar code to your envelop, check out the link at the bottom. It seems to state the bar codes used in Word 2003 are no longer compatible with the USPS. It then gives some alternatives.
Word 2010 Envelope: How do I get a bar code below the address? - Microsoft Answers
You can also check help for Word 2007 and search for bar codes.
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