Microsoft shuts down Exchange Web Services

On June 5, 2026, Microsoft officially announced the phased shutdown of Exchange Web Services (EWS) in Exchange Online. This decision poses significant challenges for IT teams worldwide, as EWS has been a proven interface for accessing Exchange data. Microsoft plans to completely replace EWS with the more modern Microsoft Graph API, which offers a more comprehensive and flexible solution.

Markus Müller, Global Field CTO API Management at Boomi, commented on the technical pitfalls associated with this transition. Migrating from EWS to Microsoft Graph requires careful planning and implementation to ensure that existing applications and integrations continue to function smoothly. IT teams must adapt to the new requirements and opportunities that the Graph API offers.

Technical Challenges of Migration

The migration from EWS to Microsoft Graph presents several technical challenges. One of the biggest hurdles is adapting existing applications that are based on EWS. Many companies have developed custom solutions that rely on the features of EWS and now need to revise these solutions to integrate the new API interfaces.

Another aspect is the training of IT staff. Since the Microsoft Graph API uses a different architecture and authentication mechanisms, IT teams need to familiarize themselves with the new technologies. This can take additional time and resources, which are already scarce in many companies.

However, the transition to Microsoft Graph also presents opportunities for companies to modernize and streamline their systems. The Graph API allows access to a variety of Microsoft services through a unified interface, making integration and data exchange between different applications easier. This could lead to a better user experience and increased productivity in the long run.

Action Steps for IT Teams

IT teams should immediately begin planning the migration to minimize the impact of the EWS shutdown. An initial step could be to take inventory of all applications and integrations currently using EWS. This allows for a targeted analysis of the necessary adjustments and prioritization of the migration.

Additionally, it is advisable to utilize training resources for the Microsoft Graph API to expand knowledge within the team. Microsoft offers extensive documentation and training materials that can assist IT teams in getting acquainted with the new API. Early training can help make the transition smoother.

The shutdown of EWS will occur gradually, meaning that IT teams have time to adjust to the changes. Nevertheless, it is important to act proactively to avoid potential disruptions in business operations. Timely migration to Microsoft Graph can help ensure service continuity.

Microsoft has already announced that the complete shutdown of EWS will take place by the end of 2026. Therefore, companies should implement their migration strategies as soon as possible to meet deadlines and take advantage of the new Microsoft Graph API.