I wrote a custom function in a module, then saved the workbook as an Excel
2007 Add-In... I sent that Add-In to someone else who, and had them enable
the Add-In... The Add-In was successfully enabled, but they can't use the
custom function that I wrote.

They can go into the VBE, see the Add-In, see the module that the custom
function is stored in, and see the code for the custom function, but can't
use the function unless they copy the code from the Add-In Module to a module
in their Workbook.

Please help me figure out why the custom function isn't working from the
Add-In! Thank you!!!!!