Microsoft confirms October 2026 Windows updates are causing Exchange Server failures and shares a temporary workaround for administrators.

October Windows Server updates may disrupt Exchange email. Learn which servers are affected, the symptoms, and Microsoft's registry workaround.

Microsoft released out-of-band Exchange Server security update that fixes a high-severity mailbox access vulnerability (CVE-2026-96940).

Microsoft has confirmed that this month's Windows Server security updates are causing OWA sign-in and mail delivery issues on some Exchange Server systems.

Microsoft patches CVE-2026-96940, which lets authenticated attackers read other users' Exchange mailboxes within the same organization.

Microsoft provided a brief update on Tuesday of its Exchange Server roadmap, including the news that Exchange Server Subscription Edition (SE) will be arriving in the third quarter of 2025. Once ...