John wrote:
I want to find out how I can insert our company's logo into the
default "return address" in Word 2003's "Envelopes and Labels" tool.

Use the special AutoText entry EnvelopeExtra1 to hold the logo. See
http://www.gmayor.com/Alternative_Return_Addresses.htm for examples.

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Regards,
Jay Freedman
Microsoft Word MVP FAQ: http://word.mvps.org