Preview the Office 365 REST APIs
Use Exchange Web Services (EWS) and other web services to create custom solutions that enable your users to access and manage mailbox data from services, websites, desktop computers, and mobile devices.
Get more, learn more, do more
See how to use the EWS Managed API to send email messages, search mail folders, get contact information, check user availability, and more.
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Learn more about Exchange development and Exchange APIs.
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What are apps for Office?
Apps are web applications that extend what a document, email message, or meeting request can do in Office.
Run them in multiple environments like Office desktop applications, Office Online, and mobile browsers—in the cloud or on your site.