Built with Web technologies, Apps for Office are a new class of add-in customization for Office 2013 and Office 365. In this video, we will go through the full workflow of building an app for Office with Visual Studio, from creating the app and debugging it across multiple Office applications to publishing it onto Windows Azure.
Module extensibility allows app developers the ability to create new modules within Outlook. Similarly to Outlook's native mail, calendar and task modules developers can now provide their users with their own module which will host their app’s content. This new functionality is based on the existing Add-ins platform which allows you to extend Office applications using web technologies and distribute Add-ins via the Office store or via private catalogs.