I have a customer who wants to use Excel files as a database. I know you can connect to a single workbook and build queries off the different worksheets. For example, the worksheets can be joined by a key field. The customer wants to join and query multiple workbooks. I don't see a way to do this but checking to see if I missed it.
They also want to be able to save results back to the Excel file. Not sure if this is supposed to work but I tried doing a "Save Table" and this crashes JMP 16.0.