Summary The /INTEGRITYCHECK linker option provides Windows kernel digital signature verification for user mode Portable Executables (PE) files. This linker option is required for anti-malware and anti-cheat scenarios to register components with the Windows Security Center. You must sign IntegrityCheck-linked user mode PEs using Trusted Signing (formerly Azure Code Signing). The cross-signing ...

Discover the differences between Microsoft Copilot Chat and Microsoft Copilot — explore features available with and without a license.

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Learn how to use the Gaming Services Repair Tool to troubleshoot installation and update issues with Gaming Services on PC.

Get an error message or error code when making a purchase on Xbox or have a question about using VPN on Xbox? Find out what they mean.

Introduction The article outlines the new Application Control for Business (formerly known as Windows Defender Application Control (WDAC)) handling logic for signer rules where a TBS hash value for a Microsoft intermediate certificate authority (CA) is specified. Microsoft Issuing CAs Microsoft and Windows components are signed by leaf certificates mainly issued by six Microsoft Issuing CAs ...

Corporate administrators can also re-sign templates and add-ins to ensure that only approved content is run on company computers. If you create an add-in that adds code to a macro project, your code should determine if the project is digitally signed and should notify the users of the consequences of changing a signed project before they continue.

Important An improvement was included in Windows updates released on and after October 28, 2025, that refined User Account Control (UAC) prompt requirements while still addressing the security vulnerability, CVE-2025-50173. This improvement addressed an issue that created unexpected UAC prompts for some apps, including Autodesk AutoCAD. Before attempting the resolution steps included in this ...

Before Windows Vista, SMBv1 clients that did not have signing explicitly enabled could not perform Enabling Audit Support for SMB signing. This behavior was changed with the release of Windows Vista and was also backported to Windows XP and Windows Server 2003 through updates.

To work around this issue use Outlook Web Access (OWA), Office Web Applications, or mobile applications. As we work through the issues that cause the 1001 error, we are listing out the primary root cause scenarios in the ISSUE section above. Please review that section to see which may apply to your environment. The Microsoft 365 teams are investigating this issue by analyzing logs provided by ...