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...
cisa guidance
cu14
cu15
cve-2025-53786
dedicated hybrid app
entra id
ews
exchange hybrid
exchange server
exchange server 2016 cu23
graph permissions
health checker
hotfix update
hybrid configuration wizard
migration to dedicated hybrid app
se rtm
september 2025
service principal
windows update
