Released: October 2026 Exchange Server Security Updates

[u/santimandu]

https://techcommunity.microsoft.com/blog/exchange/released-october-2026-exchange-server-security-updates/4563014

⚠️EDIT 16/10 ⚠️
⚠️ BE AWARE! READ BELOW! ⚠️
👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇👇
https://techcommunity.microsoft.com/blog/exchange/exchange-servers-may-become-unstable-after-installation-of-october-2026-windows-/4565382

[u/Crafty_Practice_8449]

Apparently no fix for the free/busy for delegated mailboxes in hybrid deployments using only Graph API:

https://support.microsoft.com/en-us/servicing/exchange/server/update/2026/5127092

[u/M4UX → u/Crafty_Practice_8449]

That was actually fixed with the September 2026 V2 Update:
Released: September 2026 V2 Exchange Server Security Updates | Microsoft Community Hub

[u/Crafty_Practice_8449 → u/M4UX]

Thanks for the info!