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

Get an error message or error code when making a purchase on Xbox? Find out what they mean.

This page provides support links for home users and support phone numbers for business users.

Xbox Support 提供有关 Xbox、Game Pass 和账单问题的帮助，并通过社区提供建议和客户服务。

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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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If you are using a Windows 10 device, start by running the automated camera troubleshooter in the Get Help app. It will automatically run diagnostics and attempt to fix most camera problems.

See how to view the details for signatures and certificates.

Learn how to download and install apps you need from your Microsoft 365 business subscription.

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