The answers are No, and No.
As Word can only use a single flat file as the data source for a mail merge,
you will need to combine the lists into one data source.
You could do that by creating a Directory Type mail merge main document in
which you insert the mergefields into the cells of a one row table. In
turn, attach each data source to that mail merge main document and execute
the merge to a new document. For each data source, this will give you a
document containing a table with a row of data for each record in the data
source. Copy and paste these tables into one document so that they form a
single table. To remove the duplicated records, see the article "Find and
Replace using Wildcards" on fellow MVP Graham Mayor's website at:
http://www.gmayor.com/replace_using_wildcards.htm
Finally, insert a row at the top of the combined table into which you insert
the field names to be used in your mail merge process.
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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