Specifies the data source for the mail merge.
An object that specifies the data source from which the merged data is retrieved.
Any object implementing the IList interface can serve as the data source for the spreadsheet mail merge. Assign the data source object to the MailMergeDataSource property of the mail merge template workbook.
When connecting to a data source that contains multiple data tables, specify the required data member using the IWorkbook.MailMergeDataMember property. See the How to: Perform a Mail Merge example for details.