It sounds as if what they need is your data, not really a Word document, and
it might be useful to find out exactly what they can work with

What I would probably try to do is:
a. create a new Mail Merge Main document (choose the Catalog/Directory type
mailmerge
b. put a table consisting of a single cell into the document
c. copy/paste the fields you used in the first label in your earlier merge
innto the cell
d. do the merge, outputting to a new document. You should end up with a
one-column table with a complete address in each row
e. Add a cell at the top and type the Word "Address" in it.

If they can use a regular Word document, they can probably use that, and the
addresses are already complete addresses that can be inserted in a (Word)
mailmerge using a single mergefield.

If they can't use something with table cells, just put leave out step (b)
and make sure you have an empty paragraph at the end of the mail merge main
document. They'll have to sort out stuff like variable numbers of lines in
addresses.

If they can't use that, consider just putting the appropriate merge fields
in a single row, separated by tabs, and do the merge. They then end up with
a Word document containing a tab-delimited set of source records.

Peter Jamieson
containing a table with one cell
b.
When you merge labels to a new document, all you are really doing is
creating a Word document with a table

I think you need to find out exactly what they want.  Peter's suggestion
sounds like the right one to me.  Maybe they want the data source in a
regular Word document so that they can do the merge

See "Convert Labels into Mail Merge Data File" on fellow MVP Graham Mayor's
website at:

http://www.gmayor.com/convert_labels_into_mail_merge.htm