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

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 Windows Server security updates released on October 13, 2026, can disrupt Exchange Server email ...

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.

German]The security updates for Windows Server released by Microsoft on October 13, 2026, are also affecting Microsoft Exchange Server. Reports on my German blog and across the internet indicate ...

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

Microsoft has confirmed that the October 2026 Windows Patch Tuesday updates are causing stability problems on some Exchange Server deployments, leading to Outlook on the web (OWA) failures, growing ...

Microsoft ends security updates for Exchange Server 2016 and 2019 and Skype for Business Server 2015 and 2019 after the ...

Microsoft took down the Exchange Admin Center (EAC) today after a code change left administrators facing an "Internal Server ...

Microsoft has released September 2026 V2 security updates to fix an Exchange Server flaw that lets authenticated attackers access other users’ mailboxes within the same organization.

Microsoft investigates an Exchange admin center outage affecting some admins with internal server errors as a rollback begins ...

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