See "Formatting Word fields with switches" on fellow MVP Graham Mayor's
website at
http://www.gmayor.com/formatting_word_fields.htm

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Hope this helps,
Doug Robbins - Word MVP
> Word 2003 drops the leading zero from a five digit postal zipcode during
> mailmerge. The mailmerge data base is an Excel file, where zipcode data
> is
> formatted as a ' number -- zipcode' and correctly displays the leading
> zero.
> (Computer is operating XP SP2)