Do you have the Amazing Calendar for the 64 bit operating system?
The Amazing Calendar Maker is now considered a discontinued product. It doesn't appear on the developer's website anymore. However, they have another application that is server based which means you need the IIS to be installed and then the server and other people can access and create calendars with the help of clients.
It's best to visit the official website to learn about the software and the way it works now.
