About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.

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The Microsoft Authenticator app helps you sign into your accounts when you're using two-step verification.

To use mobile apps on your Windows 11 PC, you need to install the Amazon Appstore. Once it's set up, you'll be able to browse and install mobile apps from a curated catalogue.

若要在Windows 11电脑上使用移动应用，需要安装Amazon Appstore。 设置完成后，你将能够浏览和安装精选目录中的移动应用。 Android 是 Google LLC 的商标。 开始之前 Amazon Appstore和移动应用仅在部分国家和地区可用。 若要了解你的国家或地区是否受支持，请转到 支持 Windows 上Amazon Appstore的国家和地区 ...

Need help with an Xbox console, an Xbox game, or Xbox network? Find out how to get in touch with us.

Learn how to sign in and create app passwords for Microsoft apps and devices that don't support two-step verification.

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Microsoft Authenticator is a free app that helps you sign in to all your accounts without using a password - just use a fingerprint, face recognition, or a PIN.

See how to view the details for signatures and certificates.