Isn't it a bit early for Christmas Cards?
Create a separate envelope merge document, useing 'envelope' as the document
type.
The procedure is essentially that at
http://www.gmayor.com/mail_merge_labels_with_word_xp.htm albeit with a
different document type.

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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> I want to print names and addresses directly to my envelopes for my
> Christmas cards. How can I merge my list and from Word to print only
> the evelopes?