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 What is OAuth2? OAuth2.0 is an open authorization protocol, which allows accessing the resources of the resource owner by enabling the client applications on HTTP services such as Facebook, GitHub, etc. It allows sharing of resources stored on one site to another site without using their credentials. It uses username and password tokens instead. Why Use OAuth 2.0? You can use OAuth 2.0 to read data of a user from another application. It supplies the authorization workflow for web, desktop applications, and mobile devices. It is a server side web app that uses authorization code and does not interact with user credentials. Features of OAuth 2.0 OAuth 2.0 is a simple protocol that allows to access resources of the user without sharing passwords. It provides user agent flows for running clients application using a scripting language, such as JavaScript. Typically, a browser is a user agent. It accesses the data using tokens instead of using their credentials and stores data in online fil

  Microsoft Office365 EWS servers have been extended to support authorization via the industry-standard OAuth 2.0 protocol. Using OAUTH protocol, user can do authentication by Microsoft Web OAuth instead of inputting user and password directly in application Microsoft / Office 365 OAuth + EWS We can use the OAuth authentication service provided by Azure Active Directory to enable our application to connect with IMAP, POP or SMTP protocols to access Exchange Online in Office 365. To use OAuth with our application we need to register application on Azure Active directory and other steps also we need to do to get the access token back. Below are the steps   To use Microsoft/Office365 OAUTH in your application, you must create an application in  https://portal.azure.com . Sign into the Azure portal using either a work or school account or a personal Microsoft account. If your account gives you access to more than one tenant, select your account in the top right corn