Word 2013 won't open my Excel 2013 data base file.
I have MS Office Professional 2013. Word will not open my Excel file to perform a mail merge. The message is "Word was unable to open the data source" and if I try to create a new list I get "Error has occurred: Class not registered." What can I do?
Try going to File>Options>Advanced and scroll down to the General section of the dialog and check the box for "Confirm file format conversion on open" and then when you attach the data source to the mail merge main document, check the Show all box in the
dialog that appears and try one of the other methods of making the connection.
You might also refer to the following website for information on repairing Office 2013\365: