Most RecentNewest TopicsMost LikesMost ViewedReleased: August 2026 Exchange Server Security Updates We have released Security Updates for Exchange Server SE. Exchange Server 2019 and 2016 ESU updates only. Exchange Online EWS, Your Time is Almost Up We wanted to provide an update on Exchange Online EWS deprecation. Introducing EWSAllowedAppIDs: Preparing for the Final Phase of EWS Retirement We wanted to share details about the EWSAllowedAppIDs, to help you manage retirement of EWS applications in Exchange Online. 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. 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. Cross-tenant Free/Busy, MailTips, and Calendar Sharing are moving to Cross-Tenant Access Policy We wanted to provide information related to migration of existing Exchange Online Organization Relationships to the new sharing model. Notes From the Field: Finding and Remediating EWS App Usage Before Retirement We wanted to share some tips on how to find out details of EWS usage in your tenant. Notes from the field: testing EWSAllowedAppIDs safely We wanted to share some tips on how to test EWSAllowedAppIDs (EWS AppID allow list). Where is Exchange SE CU1 anyway? We wanted to discuss why we are somewhat late with releasing Exchange SE CU1. Announcing Period 2 Exchange 2016/2019 Extended Security Update (ESU) program We created a Period 2 ESU for Exchange customers who need extra time to migrate to Exchange SE.
