Use the Information Protection viewer to view protected files in Windows, Android, iOS, or Edge.

Find out how to submit a request for a refund for a purchase of digital Xbox content.

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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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Learn how to identify and open encrypted and protected emails no matter what email client you're using.

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

If you have a Microsoft 365 Family or Microsoft 365 Personal subscription, Outlook includes encryption features that let you share your confidential and personal information while ensuring that your email message stays encrypted and doesn't leave Microsoft 365. This is useful when you don't trust the recipient's email provider to be secure. To see encryption options, compose a new message ...

Use a ready signature template from a gallery to create your email signature in Outlook.

Microsoft 365 can be configured to recommend or automatically apply a sensitivity label to a file or email if it includes sensitive corporate or personal information, such as social security numbers, credit card numbers, or bank account numbers. This helps you keep your files and messages compliant with your organization's information protection policies even if you haven't applied a ...

Information Rights Management (IRM) allows you to specify access permissions to email messages. IRM helps prevent sensitive information from being read, printed, forwarded, or copied by unauthorized people. IRM also helps organizations enforce corporate policy governing the control and dissemination of confidential or proprietary information, both within the organization and with customers and ...