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

Microsoft has confirmed that Windows Server security updates released on October 13, 2026, can disrupt Exchange Server email ...

Microsoft has acknowledged that the October 2026 Windows Server updates may be destabilizing Exchange Server. The problems are related to this list of Windows Server updates (see here) and Microsoft ...

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

Microsoft warns that the October 2026 Windows Server updates may destabilize on-premises Exchange servers. OWA (Outlook on the Web) logins fail, and mail ...

Exchange servers go down after Windows Server’s October updates. Microsoft is investigating the issue.

Microsoft has pushed out an out-of-band security update for Exchange Server that fixes a high-severity vulnerability (CVE-2026-96940) that may allow authenticated attackers to read emails and ...

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

Microsoft Patch Tuesday October 2026 fixed a record 1,413 CVEs, including an actively exploited Windows Shell zero-day, CVE-2026-96951, that strips download security warnings. Five Outlook ...

Microsoft released its monthly security updates on October 13 (October 14 JST). There were 1,417 CVEs assigned by Microsoft, with one zero-day, CVE-2026-96951, in the Windows Shell confirmed to be ...

Windows updates that Microsoft released as part of its October Patch Tuesday, as well as preview versions released earlier, ...