The latest update for Windows 10 and 11 is piling up the issues. From its small name KB5027231, it causes a bug that prevents users from opening certain Office applications as well as Outlook. Here is how to solve this problem.

It’s the return of Clippy thanks to ChatGPT on Windows, but also bugs. According to Microsoft, Windows 10 and 11 users may experience a bug that prevents Outlook and some Office apps from launching after installing build KB5027231, released on June 13: the same Windows update that may cause a bug fatal. Definitely…

The Redmond firm has updated its Windows Health Dashboard documentation to provide the necessary details on this issue and offer affected customers solutions.

Microsoft says this bug specifically affects Office 32-bit, installed on Windows 10 and 11 64-bit versions 22H2 and 21H2, as well as Windows Server 2022. Even though Microsoft has changed the default installation of Office from 32 to 64-bit in 2018, many people still use 32-bit Office. However, the bug is only encountered with certain antiviruses: according to Microsoft, it only occurs on systems using versions of Trellix Endpoint Security prior to 35.31.25.

What does Microsoft say about this Windows bug?

After installing KB5027231 or later updates on Windows devices with certain antivirus, antimalware, or security software installed, you may not be able to open Microsoft or third-party applications. Known affected applications are Microsoft Outlook and other Microsoft Office applications. This issue only occurs with 32-bit applications running on 64-bit Windows with a Trellix Endpoint Security version earlier than 35.31.25. When trying to open an affected application, the event log shows an access violation with the error “module is unknown”.

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Users affected by the bug can resolve this issue simply by updating Trellix Endpoint Security Agent to version 35.31.25 or newer. Although Microsoft only mentioned this antivirus, other applications can cause this bug. The Windows publisher therefore recommends that people who use other anti-viruses and who are unable to open Office applications to contact their supplier’s customer service.

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