Recent Blog ArticlesNewest TopicsMost LikesTagged:TagThe first temporary enforcement of dedicated hybrid app use is coming on September 16 A reminder that on September 16 2025, we will enforce the first temporary block of shared security principal use for our hybrid customers. Released: September 2025 Exchange Server Hotfix Updates We have released Hotfix Updates for Exchange Server Subscription Edition (SE), 2019 and 2016. Limiting Onmicrosoft Domain Usage for Sending Emails We are announcing that all Exchange Online customers who send external email should start switching to custom (aka vanity) domain names. Introducing Cloud-Managed Remote Mailboxes: a Step to Last Exchange Server Retirement We are excited to announced a feature that enables cloud management of email properties for users with remote mailboxes. Released: August 2025 Exchange Server Security Updates We have released Security Updates for Exchange Server SE, Exchange Server 2019 and Exchange Server 2016. Dedicated Hybrid App: temporary enforcements, new HCW and possible hybrid functionality disruptions We are announcing enforcements to move customers along to using the dedicated hybrid app. Direct Send vs sending directly to an Exchange Online tenant This post discusses what Direct Send is, is not, and how to help control email sent directly to your tenant. Use GitHub Copilot to help speed up your transition from EWS We wanted to let you know about AI powered tools to help you migrate your EWS apps before Exchange Online EWS deprecation. Deprecation of native public folder migrations to service from very old versions of Exchange Starting in October 2025, you will not be able to migrate public folders to Exchange Online using native Microsoft tools. Announcing Exchange 2016 / 2019 Extended Security Update program We are announcing an optional 6-month Extended Security Update (ESU) program for Exchange 2016 and 2019.
