Create an Add-In for PowerPoint 2007+ 2011 MAC

We would like an Add-In developed that is compatible with all versions of Powerpoint from 2007+ (including Mac). This plugin will do the following: - Display a toolbar with a button and a dropdown in the Ribbon in Powerpoint - Clicking the button will open a dialog that promps the user with a single text box and allows the user to add items to a dropdown - Clicking 'OK' on the dropdown will make an HTTP POST request to a web service and update the contents of the dropdown in the Ribbon based on JSON data returned by that web call - Choosing an item from the dropdown will insert a new slide into the existing presentation displaying a web control which is able to make web requests.