Today, October 14, 2025, Exchange Server 2016 and Exchange Server 2019 reach end of support. It’s critical to upgrade now to remain supported and secure.
Microsoft will no longer provide technical ...
Updated Oct 14, 2025
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Is there any guides yet for what people who are on 2025 DC's with 2025 FFL are supposed to do in light of the current bug?
Nino_Bilic
Microsoft
MicrosoftMy recommendation would be to wait; last I heard, the fix should be in November Windows updates (this may change).
Ok, I will do that thanks. Do you have a link or something that I can monitor the status of this, and if it gets resolved in November?
I want to minimise my time on an exposed Exchange 2016 at this point.
- Nino_Bilic
My expectation is that the fix will be listed as a "issue resolved" issue in the KB, just like the known issue is being tracked in the KB now (see known issues here - October 14, 2025—KB5066835 (OS Build 26100.6899) - Microsoft Support)