Microsoft

Close-up of a blue screen error shown on a data center control terminal.

Windows Server October 2026 updates can break Exchange sign‑in and mail flow

October 2026 Windows Server updates may stop Outlook Web Access sign‑in and delay mail on Exchange servers; a registry tweak raises the Endpoint Mapper limit as a temporary fix.

Contemporary computer with black screen placed on stand near row of server steel racks in data center

Windows Update certificate expiration in 2027: what you must do

Older Windows devices will lose security updates after Microsoft’s certificate expirations in May and June 2027. Find out which versions are affected, the required patches, and how to keep your fleet protected.

Laptop displaying a security lock icon on a table with a potted plant and clock.

Microsoft September 2026 Windows Update Breaks Always On VPN Connections

The September 2026 Windows 11 update can stall Always On VPN connections when automatic protocol selection is enabled. A temporary fix forces the profile to use a single protocol while Microsoft works on a permanent solution.