October Windows Server Updates Causing Exchange Sign-In and Mail Flow Disruption

Microsoft confirmed that this month's Windows Server security patches are triggering Outlook Web Access (OWA) login failures and email delivery problems…

If your organization runs Exchange Server on Windows Server, hold off on applying October patches until Microsoft releases a confirmed fix. Monitor Microsoft's security bulletins and update channels for resolution. Consider pausing rollout if already deployed and experiencing OWA or mail flow issues.