Please refer my previous articles to create an app for Outlook Web App Visual Studio 2013: http://www.c-sharpcorner.com/UploadFile/anavijai/office-365-how-to-create-an-app-for-outlook-2013-using-visu/ Napa Tool: http://www.c-sharpcorner.com/UploadFile/anavijai/office-365-how-to-create-an-app-for-outlook-web-app-using-n/ In this blog you will see how to get the recipients in a read form in Outlook Web App. AppRead folder: Home.html