Episode
The End of EWS: Migrating to Microsoft Graph with Glen Scales [MVP]
- Published
- May 20, 2026
- Duration seconds
- 2866
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Summary
The retirement of Exchange Web Services (EWS) marks one of the biggest transitions in Microsoft messaging development in nearly two decades. For organizations still relying on legacy Exchange integrations, migration is no longer optional — it is urgent. In this episode of the m365.fm podcast, Mirko Peters sits down with longtime Exchange developer, Microsoft MVP, blogger, open-source contributor, and messaging expert Glen Scales to discuss the end of EWS, the future of Microsoft Graph, and what developers and organizations need to do right now before Microsoft permanently disables EWS in Exchange Online. With more than twenty years of experience building against Exchange APIs, Glen has lived through nearly every generation of Microsoft messaging development — from CDO and WebDAV to EWS, OAuth, and Microsoft Graph. His blog posts, GitHub repositories, Stack Overflow answers, and Substack articles have helped thousands of developers solve real-world Exchange and Microsoft 365 challenges. This conversation dives deep into API evolution, migration strategies, Graph limitations, mail architecture, authentication, throttling, notifications, synchronization, PowerShell automation, and the changing future of enterprise messaging development. WHY THE END OF EWS MATTERS Microsoft will retire Exchange Web Services in Exchange Online beginning in October 2026, with full removal completed in April 2027. That means: Applications using EWS against Microsoft 365 will stop working Organizations must identify legacy dependencies now Vendors and internal development teams need migration plans immediately Old synchronization models may need redesigns Security and permission models must be modernized Glen explains that many organizations still do not realize how deeply EWS is embedded insi…