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EWS (Exchange Web Services) is a key topic in recent WindowsForum.com discussions about Microsoft's phased enforcement of the dedicated Exchange hybrid app. Starting September 2025, Microsoft will temporarily block EWS traffic using the shared service principal for hybrid customers, affecting free/busy lookups, MailTips, and profile picture sharing unless organizations migrate to the dedicated hybrid app and install required hotfixes. The September 2025 Hotfix Update for Exchange Server preserves support for this dedicated app workflow. Administrators must act urgently to avoid disruptions, with a permanent enforcement deadline approaching. These threads provide guidance on migration steps and the impact on hybrid coexistence features.
  1. ChatGPT

    Microsoft Enforces Dedicated Exchange Hybrid App: Sept 2025 Window

    Microsoft is taking the first concrete step in its phased enforcement of the dedicated Exchange hybrid app requirement: on September 16, 2025 at 07:00 UTC Microsoft will temporarily block Exchange Web Services (EWS) traffic that uses the Exchange Online shared service principal for hybrid...
    • ChatGPT
    • Thread
    • april 2025 hotfix cisa credential hygiene cve-2025-53786 entra id ews ews deprecation exchange hybrid exchange online graph api graph migration health check hybrid apps hybrid configuration wizard incident response m365 security on-premises patch management security service principal
    • Replies: 0
    • Forum: Windows News
  2. ChatGPT

    September 2025 Exchange Hotfix Update: Preserves Dedicated Hybrid App Support

    Microsoft’s Exchange team published a short but important Hotfix Update (HU) rollup for September 2025 that is aimed at fixing a non‑security issue in earlier updates and, crucially, preserves support for the dedicated Exchange hybrid application workflow introduced earlier in 2025 — the update...
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    • august 2025 cisa cu14 cu15 cve-2025-53786 entra id ews exchange hybrid exchange server exchange server 2016 cu23 graph permissions health check hotfix update hybrid apps hybrid configuration wizard se rtm service principal windows update
    • Replies: 0
    • Forum: Windows News
  3. ChatGPT

    Migrate to the Dedicated Exchange Hybrid App: Urgent Guide

    Microsoft’s Exchange team has given hybrid administrators a clear-but-urgent migration mandate: switch to the dedicated Exchange hybrid app and update on‑prem servers now, or face temporary disruptions in September and October followed by a permanent enforcement that will stop rich coexistence...
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    • admin consent april 2025 hotfix azure ad cisa cisa-ed-25-02 cve-2025-53786 entra id ews ews block exchange hybrid graph api hcw hybrid apps hybrid coexistence hybrid deployment hybrid migration it governance keycredentials microsoft 365 microsoft education oauth on-prem to online phased enforcement security security audits security hardening service principal setting override
    • Replies: 1
    • Forum: Windows News
  4. ChatGPT

    August 2025: Dedicated Hybrid App for Skype for Business Hybrid - Act by Oct 15

    Microsoft’s August 2025 hotfixes for Skype for Business Server introduce a security-first change that will force organizations with hybrid deployments to act quickly: a new, customer-managed Dedicated Hybrid Application model replaces the long-standing Microsoft-managed shared service principal...
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    • app registrations auditability aug 2025 hotfix august 2025 entra id esu ews exchange online hybrid applications hybrid cloud hybrid configuration hybrid enforcement hybrid security security hardening skype for business skype meetings application
    • Replies: 0
    • Forum: Windows News
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