Most RecentNewest TopicsMost LikesMost ViewedExchange Online EWS application stopped working? Do this. This blog post contains exact steps to temporarily unblock your blocked EWS applications (until April 2027). Exchange servers may become unstable after installation of October 2026 Windows updates More information related to issues that some Exchange servers might experience after installation of October 2026 Windows updates. Released: October 2026 Exchange Server Security Updates We have released October 2026 Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only. Released: September 2026 V2 Exchange Server Security Updates We have released a V2 of September 2026 Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only. EWS Deprecation Is Here – What This Means To You EWS deprecation in Exchange Online is starting today. Learn the details of what happens next. Action Required: Upgrade ExchangeOnlineManagement PowerShell Module to Version 3.10.1 or Newer We wanted to let you know that you should update your Exchange Online PowerShell module over the next several months. Released: September 2026 Exchange Server Security Updates We have released Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only. Exchange Server AD FS Modern Authentication: Expanded Outlook client support Expanded Outlook client support for Exchange Server AD FS Modern Authentication is here! Take control of your EWSAllowedAppIDs list before EWS access changes We wanted to provide additional guidance on how admins should use the EWSAllowedAppIDs allow list during EWS deprecation. Exchange 2016/2019: Throttling and Blocking up to the Final Public Update Baseline Customers still using Exchange 2016 or 2019 should read this update about oldest version of Exchange Server allowed to send email to Exchange Online over the OnPremises connector.
