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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

Learn what to do about error code c00d11e2, c00d129b, c00d1334, c00d1338, c00d1374, c101000b or 80190190 and the Zune service or software.

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.

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Three ways to add copyright or trademark symbols to your Outlook messages.

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。

If you see error code 0x87E00011 when you try to download content to your Xbox console, try the solution below.

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The list of names and email addresses that are suggested as you begin to type in the To, Cc, and Bcc boxes can be imported or copied and used on another computer.

If you see error E207 when you try to turn on or update your Xbox console, this means there may have been a problem installing the update. Find more solutions here.