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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

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You can easily insert a check mark (also known as a "tick mark") in Word, Outlook, Excel, or PowerPoint. These marks are static symbols. If you're looking for an interactive check box that you can click to check or uncheck, see: Add a check box or option button (Excel) or Make a checklist in Word. In your file or message, place the cursor where you want to insert the symbol. Open the Symbol ...

游戏最酷的事情之一是，这是结交新朋友的绝佳机会。 当你找到你喜欢玩的人时，请将他们添加到你的好友列表中。 这是建立一个志同道合的玩家网络的好方法，他们分享你的兴趣和打法。 有点像在 Xbox 社区中拥有自己的社区。

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。

How to create or edit your Outlook signature for email messages. Include your signature, text, images, electronic business card, and logo.

Find everything you need to manage your Microsoft account, Xbox profile, and more.

How to add a signature to your Word documents. You can also use the Signature Line command in Word to insert a line to show where to sign a document.

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

了解如何添加新的 Xbox 好友，以便快速在线找到他们，为你的下一场游戏冒险做好准备。