On April 18th 2025, Microsoft announced [Exchange Server Security Changes for Hybrid Deployments](https://techcommunity.microsoft.com/blog/exchange/exchange-server-security-changes-for-hybrid-deployments/4396833) and accompanying non-security [Hot Fix](https://techcommunity.microsoft.com/blog/exchange/released-april-2025-exchange-server-hotfix-updates/4402471). Microsoft made these changes in the general interest of improving the security of hybrid Exchange deployments. Following further investigation, Microsoft identified specific security implications tied to the guidance and configuration steps outlined in the April announcement. Microsoft