Microsoft’s EWS shutdown should be treated as a warning, not a one-off

https://www.techradar.com/author/markus-muller· Aug 6, 2026 · 8:57 AM UTC ·11 min read · 0 reactions · 0 comments · 5 views

TL;DR · WeSearch summary

Microsoft will begin disabling its Exchange Web Services (EWS) API on 1 October 2026, with a full shutdown planned for April 2027. The move highlights the security risks of older, less visible APIs, especially after EWS was linked to the 2024 Midnight Blizzard attack. Organizations will need to migrate to newer APIs like Microsoft Graph, but many may struggle due to hidden dependencies and limited visibility of existing EWS integrations.

Key facts

▪Microsoft announced the phased shutdown of its 20‑year‑old EWS API, starting on 1 October 2026 and ending in April 2027.
▪EWS has been used for accessing emails, calendars, contacts, and folders, and was implicated in the 2024 Midnight Blizzard cyber‑attack.
▪Research shows that 99% of organizations faced API security issues in the past year, underscoring the broader risk of legacy APIs.
▪Migrating to Microsoft Graph is recommended, but many firms lack clear insight into where EWS is still in use across internal and third‑party applications.
▪Hidden dependencies in legacy workflows and third‑party tools may be overlooked during the migration, creating potential gaps.
▪tags:[

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Publication time	Thu, 06 Aug 2026 08:57:34 +0000
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Pro Microsoft’s EWS shutdown should be treated as a warning, not a one-off Opinion By Markus Müller Published 6 August 2026 EWS shutdown exposes hidden API risks When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Nytt DDoS-rekord (Image credit: Shutterstock / ZinetroN) Copy link Facebook X Whatsapp Reddit Pinterest Flipboard Threads Email Share this article 0 Join the conversation Follow us Add us as a preferred source on Google Newsletter Subscribe to our newsletter On 1st October, Microsoft will begin disabling its Exchange Web Services (EWS) API, ahead of a full shutdown in April 2027. For many organizations, EWS has long been part of the invisible plumbing behind everyday workplace tools.

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