The Microsoft Authenticator app helps you sign into your accounts when you're using two-step verification.

Windows iOS Android View protected files in Windows using the Microsoft Purview Information Protection viewer If you are trying to open a protected file in Windows and it does not open properly, then you will likely need to use the Microsoft Purview Information Protection viewer for the desktop. The information protection viewer supports the following file types and environments.

Fraud affects everyone, and most publishers and developers have their own sets of rules for combatting fraudulent purchases. Microsoft protects community members from financial fraud by securing account info and ensuring that players buy only from trusted retailers. Circumventing these safety measures can lead to serious consequences.

如果這是您第一次變更玩家代號，您可以免費變更一次。 無論是我們是在您第一次註冊 XBOX 時自動為您建立的 (表示不是您自己) 選擇的，還是您在註冊時建立了自己的玩家代號，這都無關。

A popular tactic of criminals is the "fake order" scam. The way it works is that you get a message, usually in email or text, that appears to be a routine confirmation for an order. Of course, you never ordered whatever product or service it's confirming. The message looks common enough, and it says that money will be charged to your credit card or withdrawn from your bank account for the ...

Provides information for avoiding and reporting Microsoft technical support scams.

Learn how to add all your different accounts to the Microsoft Authenticator app.

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

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

The Microsoft Authenticator app backs up your account credentials and related app settings, such as the order of your accounts, to the cloud.