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This article provides information that will help you select the authentication standard that's right for your application.

The authentication method that you choose depends on the security requirements of your organization, whether you are using Exchange Online or Exchange on-premises, and whether you have access to a third-party provider that can issue OAuth tokens. Although you can use HTTP with Exchange on-premises servers, we recommend that you use HTTPS for any request that your application sends to an EWS endpoint to help secure communication between your application and an Exchange server.Įxchange provides the following authentication options for you to choose from: If you're targeting Exchange Online, the authentication method that you choose must use HTTPS to encrypt the requests and responses that your application sends.

Exchange Online, Exchange Online as part of Office 365, and on-premises versions of Exchange starting with Exchange Server 2013 support standard web authentication protocols to help secure the communication between your application and the Exchange server. Find information to help you choose the right authentication standard for your EWS application that targets Exchange.Īuthentication is a key part of your Exchange Web Services (EWS) application.