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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

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

Xbox 提供了一个应用，从最大化 Xbox Game Pass 订阅到管理家庭屏幕时间，以及直接在手机或移动设备上购买游戏，一应俱全。

Go to Payment & billing and select Payment options. You can add or edit payment methods from here. Under Payment methods, you can Add a new payment method, View or edit card, or Remove card. Enter your updated info, and select Save.

From the Approvals hub Select Apps in Teams. Search for and select Approvals. Select Open. If you’re in the new view of a new request, select New approval request > Adobe Sign. If you’re in the classic view, select E-sign > Adobe Sign. From a chat or channel Select Chat or Teams in Teams.

从 2025 年 3 月 19 日开始，不再支持适用于移动设备的 Xbox Game Pass。 获取有关其他设备上的云游戏的详细信息。

Signing your email messages with a digital ID helps to prove your identity and prevent message tampering.

Find out how to change your Xbox gamertag through a browser, on your Xbox console, or your Windows device.

Subscriptions with recurring billing If you have a Microsoft subscription with recurring billing, you can change how you pay at any time. You can also cancel or turn ...

Learn how to approve child purchases on Xbox, manage spending limits, and ensure a safe gaming experience for your family.