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Exchange servers may become unstable after installation of October 2026 Windows updates

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The_Exchange_Team
Platinum Contributor
Oct 16, 2026
Update October 20, 2026: Added a FAQ to this post. Since October 13, 2026 (Microsoft “Patch Tuesday” release cycle), we have seen some reports of customer issues where Exchange Servers become unsta...
Updated Oct 20, 2026
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CH4K1LJ41F4R_HELLOWORLD's avatar
CH4K1LJ41F4R_HELLOWORLD
Copper Contributor
Oct 17, 2026

Can you please answer us, because we can't be making tests in PROD environment. Also please release your updates tested and without problems. Without giving us the job to test for you. We're already paying for the software and you want to make tests with us?! I spent all weekend on my servers because of this.