Learn how to manage your Microsoft account security info and troubleshoot verification code issues.

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 ...

Learn how to find a Windows product key for activation, and when you'll use a digital license instead.

Introduction Microsoft is rolling out updated Secure Boot certificates to Windows devices to maintain protection against evolving boot-level threats. Most devices receive these updates automatically through Windows Update. This article explains why some devices are blocked from updating Secure Boot certificates, what this means, and what actions you can consider.

Last updated: October 27, 2026 ISSUE After adding an email account to Outlook for Windows (Outlook 2016, 2013, 2010 versions) you may experience the following: Your email account name shows up as outlook_ [long series of letters and numbers]@outlook.com in the Folder Pane and when composing emails using Outlook for Windows. Recipients will also receive the email from the sender with the ...

A list of devices supported with Link to Windows and other features in the Phone Link app.

注意 Microsoft Authenticator 不 适用于电脑或 Mac，因为出于安全原因，验证器应用是专为智能手机设计的。 了解详细信息。 Microsoft 不再支持超过一年的 Authenticator 版本。 始终使设备保持最新。 中国用户应阅读 如何在中国下载和使用 Microsoft Authenticator。

When you comment on a document, presentation, or spreadsheet and use the @-sign with someone's name, the person you mention receives mail with a link to your comment. Clicking the link brings them into the document and into the conversation.

摘要 Email 签名在您的业务通信中创建专业一致性，并确保收件人在每封邮件中都有您的联系信息。 在 Outlook 中，可以针对内部与外部、个人与业务) (不同目的设置多个签名，并选择是否将它们自动包含在新电子邮件、答复或转发中。 签名可以包含文本、链接、图片和图像 (如手写签名或徽标 ...

Highlights This update addresses security issues for your Windows operating system. Improvements This security update contains fixes and quality improvements from KB5064081 (released August 29, 2025). The following summary outlines key issues addressed by this update. Also, included are available new features. The bold text within the brackets indicates the item or area of the change. [App ...