Microsoft to retire Outlook REST API v2.0 in 2024 after customer backlash

Priya Walia

In an unexpected turn of events, Microsoft announced its decision to postpone the discontinuation of the Outlook REST API v2.0 until March 31, 2024, following vehement protests from its loyal customer base and partners.

Originally slated for retirement in November 2022, the company yielded to user demands for more time to transition to the modern alternative, Microsoft Graph.

The reprieve, reported by The Register, comes as a relief for developers and businesses heavily reliant on the Outlook REST API for managing objects like emails and calendar entries within Microsoft 365 and

We understand that for some applications, this change, even if anticipated, will require some work to accommodate.

Microsoft’s decision to extend the service’s lifespan was prompted by the challenges posed by migrating to Microsoft Graph, which, while functionally equivalent, requires substantial updates to legacy code to align with its evolving vision.

Despite the shifting deadlines, the tech giant remained resolute in its commitment to retiring the Outlook REST API v2.0, citing its preference for developers to embrace the more contemporary Microsoft Graph solution. To soften the transition, the company underscored that this change would not affect Outlook add-ins leveraging the Outlook REST API.

Microsoft Graph offers a modern approach to managing data and resources, aligning with the company’s ongoing strategy. However, the complexities involved in updating legacy systems have led to a prolonged standoff between Microsoft, developers, and customers.

Acknowledging the need for a transition period, Microsoft extended the initial two-year warning several times, eventually moving the deadline to an unspecified date in 2023. Users appreciated the flexibility but continued to express concerns about the migration process.

Now, with the new retirement date set for March 31, 2024, the company has provided ample notice for organizations to plan and execute their transitions.

As the tech community braces for this significant change, developers and businesses relying on the Outlook REST API v2.0 must begin preparing for the inevitable shift to Microsoft Graph.

Via The Register