Mail merge from Outlook is effected by a temporary (or permanent) document
that holds the data so updating the contacts list will not automatically
update the document containing the data. You need to re-run the merge from
scratch (preferably from Outlook) and use the original merge document as the
merge document to take the new data.
See http://www.gmayor.com/mailmerge_from_outlook.htm

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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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> I revise my outlook contact list, but the mailmerge to address
> envelopes prints the old list. How can I force the mailmerge
> recipient list to update? Joe