To learn about digital signatures (also known as digital ID), what they can be used for, and how to them in Word, Excel, and PowerPoint, see All about digital signatures. Create a signature line in Word or Excel In the document or worksheet, place your pointer where you want to create a signature line. On the Insert tab, select Signature Line in the Text group. In the Signature Setup dialog ...

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

If you want to turn off two-step verification and remove it for all devices, consoles, and apps that you use, follow the steps below. Important Because two-step verification is turned on, you’ll need two forms of identification to sign in to your account.

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

In certain countries and regions, mobile operator billing can be used as a payment option to buy subscriptions like Game Pass and content such as games, apps, music, HD movies, and TV shows on your Xbox console and Xbox.com.

Find out how to Get started with the Microsoft Authenticator app so that you can use notifications to sign in, instead of texts and phone calls. Learn How to use two-step verification with your Microsoft account.

If you want to turn off two-step verification and remove it for all devices, consoles, and apps that you use, follow the steps below. Important Because two-step verification is turned on, you’ll need two forms of identification to sign in to your account.

If you turn on two-step verification, you'll get a security code to your email, phone, or authenticator app every time you sign in on a device that isn't trusted.

如果我的代码来自其他区域，该怎么办？ 某些数字代码适用于可能与帐户上的区域设置不匹配的特定国家/地区。 如果你的帐户与你的物理区域匹配，并且你的代码是从你所在地区的零售商处购买的，请确保设备上的区域也与你的物理位置匹配。 若要从 Xbox 主机执行此作，请执行以下作：

Learn how to manage the payment information and billing for your Microsoft 365 subscription.