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
Microsoft’s Exchange team has given hybrid administrators a clear-but-urgent migration mandate: switch to the dedicated Exchange hybrid app and update on‑prem servers now, or face temporary disruptions in September and October followed by a permanent enforcement that will stop rich coexistence...
Microsoft’s August 2025 hotfixes for Skype for Business Server introduce a security-first change that will force organizations with hybrid deployments to act quickly: a new, customer-managed Dedicated Hybrid Application model replaces the long-standing Microsoft-managed shared service principal...
app registration
auditability
aug 2025 hotfix
dedicated hybrid application
entra id
esu
ews
exchange online
hybrid configuration
hybrid enforcement
hybrid security
microsoft entra id
october 15 2025
on-prem to cloud hybrid
security hardening
skype for business
skype meetings application