If your printer can handle the post cards, then you should be able to print
on them. I they are individual cards, then a formletter type mailmerge main
document should be used in which the page size matches the cards. If there
are multiple cards to a page, locate a label template (Tools>Letters and
Mailings>Envelopes and Labels>Labels>Options) that matches the size and
layout of the labels (or modify one of the existing templates to suite) and
then use a label type mailmerge.
See the article "Mailmerge Labels with Word XP" on fellow MVP Graham Mayor's
website at
http://www.gmayor.com/mail_merge_labels_with_word_xp.htm
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Hope this helps.
Please reply to the newsgroup unless you wish to avail yourself of my
services on a paid consulting basis.
Doug Robbins - Word MVP