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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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 ...

Developers have made amazing games and content for the Xbox network. To protect customers and developers, we provide a safe and secure way to make purchases in the Microsoft Store. To maintain this security, Xbox monitors for instances of marketplace theft or solicitation from the Xbox community.

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。

Restore account credentials from Microsoft Authenticator You can restore or recover your account credentials saved by Microsoft Authenticator.

View the certificate in the Personal Certificates store Open Microsoft Edge. Enter edge://settings/privacy in the address bar. Scroll down to the Security section and select Manage certificates. Digitally sign a VBA macro project in Excel, PowerPoint, Publisher, Visio, Outlook, or Word Open the file that contains the macro project that you want to sign. On the Developer tab, in the Code group ...

Get an error message or error code when making a purchase on Xbox? Find out what they mean.

Avoid and report Microsoft technical support scams Microsoft will never proactively reach out to you to provide unsolicited PC or technical support. If you receive a phone call claiming to be from Microsoft, or see a pop-up window on your PC with a fake warning message and a phone number to call and get your "issue" fixed, it's better to be safe and not click any links or provide any personal ...

How to spot a "fake order" scam A popular tactic of criminals is the "fake order" scam. The way it works is that you get a message, usually in email or text, that appears to be a routine confirmation for an order. Of course, you never ordered whatever product or service it's confirming. The message looks common enough, and it says that money will be charged to your credit card or withdrawn ...

Check the Xbox services, games, and apps for any service outages.

Find the official Microsoft licensing terms for Xbox and gaming applications for mobile devices and iPads.