Certificate authority (CA) A certificate authority is an entity similar to a notary public. It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired. Top of Page Digital signature assurances The following terms and definitions show what assurances are provided by digital signatures. Authenticity The signer is ...

Learn how to designate an Xbox console as your home Xbox so you can share content with anyone else who signs in on your console.

Learn how to locate and manage your app permissions on Windows devices. Some apps or games need specific permissions to work properly.

Xbox Support 提供有关 Xbox、Game Pass 和账单问题的帮助，并通过社区提供建议和客户服务。

Hotmail is now Outlook.com To sign in to Hotmail, you'll need your Microsoft account username and password. Sign in at outlook.live.com

Before you can use Authenticator as a way to sign in, you need to download the app and have already added Authenticator to your accounts. Starting July 2025, the autofill feature in Authenticator will stop working, and from August 2025, passwords will no longer be accessible in Authenticator.

Microsoft Store is familiar on any device—you can search for free and paid apps like Adobe Reader, view their popularity and ratings, and download them to your device.

Use the edge://apps page to see your installed applications and manage app permissions. You can sort installed applications by installation date, recently used and alphabetically. Each of your apps is presented by a card where you can view app details and manage app actions such as pinning, privacy controls and app uninstallation.

手写签名可让你的文档具有个人风格。 你可以扫描你的签名，将其存储为图片，然后在 Word 文档中插入签名。 扫描手写签名并插入手写签名的图片 在纸张上写下您的签名。 扫描该页面并以常见的文件格式将其保存在计算机上：.bmp、.gif、.jpg 或 .png。

附註: Microsoft Authenticator 不適用於PC或Mac，因為驗證器應用程式通常是針對智慧型手機所設計，基於安全性考慮。 深入了解。 Microsoft不再支持超過一年的 Authenticator 版本。 請務必讓您的裝置保持在最新狀態。 自 2025 年 7 月起，Authenticator 中的自動填入功能將停止運作，而自 2025 年 8 月起，將無法在 ...