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

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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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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 how to revisit and manage your Microsoft 365 Copilot chat history to stay organized, track insights, and continue conversations.

Here are the most likely causes for an unrecognized charge: A Microsoft subscription has recurring billing enabled. Someone you know, such as a family member, bought something with your card. You can now investigate this on the Manage your payments page. A previously declined charge was charged again. A pre-order or split order was shipped. Someone made an in-app purchase from an app, game, or ...

Want to add a padlock to your email messages? You can use encryption and digital signatures in new Outlook, classic Outlook, and Outlook on the web for work or school accounts to increase the security of messages. Encrypting an email message in Outlook means it's converted from readable plain text into scrambled cipher text. Only the recipient who has the private key that matches the public ...

Discover the differences between Microsoft 365 Copilot Chat and Microsoft 365 Copilot — explore features available with and without a license.

Microsoft Viva Insights elements are available in varying levels to users of different Microsoft Office 365 and Microsoft 365 plans. Refer to Environment requirements for Viva Insights and How can I find out what my plan is? for details. Also refer to Outlook add-in prerequisites. The Viva Insights Outlook add-in is an extension of your Microsoft Outlook experience. This add-in works within ...

Known issues in this update For the most up-to-date information about known issues for Windows 11, version 25H2, go to the Windows release health dashboard.

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。