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Microsoft enterprise service deprecations

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What changed

2026-10-02 11:58 UTC → 2026-10-26 09:14 UTC · added ~~removed~~

Microsoft has begun the phased decommissioning of the Exchange Web Services (EWS) protocol within Exchange Online, a process that commenced on October 1, 2026. This transition is part of a long-term plan to move users toward the Microsoft Graph API, with a final, permanent shutdown of EWS in Exchange Online scheduled for April 1, 2027. The decommissioning directly impacts macOS users who utilize native Apple Mail and Calendar applications with Microsoft 365 work accounts for synchronization. Because the rollout is gradual, some organizations may encounter synchronization failures, such as stalled calendar updates or mail failing to download, earlier than others. While Apple is reportedly collaborating with Microsoft to transition its native apps—including Mail, Calendar, Contacts, Notes, and Reminders—to the Graph API, a definitive solution has not yet been confirmed in recent macOS beta releases. This change specifically affects cloud-hosted Exchange Online services. Organizations utilizing on-premises Exchange servers, as well as users on iPhone and iPad, remain unaffected because those mobile operating systems utilize the Exchange ActiveSync protocol instead. To mitigate issues, affected businesses may need to temporarily re-enable EWS through IT administration or migrate Mac users to compatible clients like Microsoft Outlook. Separately, Microsoft continues the deprecation of Windows Deployment Services (WDS). While WDS remains available in Windows Server 2025 and other currently supported versions, it will no longer receive improvements and is no longer the recommended solution for deploying operating systems over a network. Microsoft has recommended that organizations begin planning migrations to alternatives such as Microsoft Configuration Manager.

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