Microsoft 365 Developer Blog

A developer platform for building collaborative apps for hybrid work

Migrating from Outlook REST API v1.0 to Microsoft Graph

Version 1.0 of the Outlook REST API was launched in 2015 to provide API access to mail, calendar, contacts, and other data from Exchange Online, with support for Basic Authentication.  Over time, we’ve released major enhancements in Outlook REST API v2.0 and Microsoft Graph, both of which provide richer features, and better performance and reliability than Outlook REST API v1.0.