How do I export the membership information that is already entered into the Church Windows system so that I can import it into an Excel file for use in our directory?
The only thing explained on the official website is how to export to Constant Contact. You can use the available PDF file to learn how to do it. Unfortunately, there isn't anything related to Excel which means you will have to go to Help > Help Topics to look at the Export function.
For more information, I recommend you check the official website of the application: http://www.churchwindows.com/shop/custom.aspx?recid=17
