Run a macro containing the following command:
Msgbox Activedocument.MailMerge.DataSource.name
Or, from the Tools menu, select Customize and on the Commands tab of the
Customize dialog, select the All Commands category and locate the
MailMergeHelper command and left click, hold and drag it onto a toolbar or
menu. Then, with the mailmerge main document open, if you activate the
MailMergeHelper, the name of the data source will appear under the Data
source section of the Mail Merge Helper dialog.
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Hope this helps,
Doug Robbins - Word MVP