You can often view a protected file by simply opening it. For example, you might double-click an attachment in an email message, a document in File Explorer, or a link to a file and be able to open the protected file. If you are trying to open a protected file that has a .pfile name extension, like a .ppng, you will need to use the Microsoft Purview Information Protection viewer or the Azure ...

Developers have made amazing games and content for the Xbox network. To protect customers and developers, we provide a safe and secure way to make purchases in the Microsoft Store. To maintain this security, Xbox monitors for instances of marketplace theft or solicitation from the Xbox community.

This cumulative update for Windows 11, version 25H2 and 24H2 (KB5077181), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained ...

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

Microsoft Support is here to help you with Microsoft products. Find how-to articles, videos, and training for Microsoft Copilot, Microsoft 365, Windows 11, Surface, and more.

Learn how to identify and open encrypted and protected emails no matter what email client you're using.

Get help if you're having problems sending someone a digital Xbox game or subscription as a gift.

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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.

了解如何从 Xbox 应用商店申请购买的退款。