Not simultaneously. You can use the one mailmerge main document for two or
more separate, unrelated merge operations, by changing the data source.
You can't however use one datasource to merge in part of the information and
then use another datasource to complete the balance of the merge.
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Please post any further questions or followup to the newsgroups for the
benefit of others who may be interested. Unsolicited questions forwarded
directly to me will only be answered on a paid consulting basis.
Hope this helps
Doug Robbins - Word MVP