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

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

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 The message looks common enough, and it says that money will be charged to your credit card or withdrawn from your bank account for the ...

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本文說明如何取得或建立用於 Office 文件的數位簽章。 欲了解更多如何在 Office 文件中使用這些簽名，請參閱 「在 Office 檔案中新增或移除數位簽章」。 何謂數位簽章？ 數位簽章或身份證通常被稱為 數位證書。 要數位簽署 Office 文件，您必須持有尚未過期的 () 數位證書。 數位憑證通常由憑證授權 ...

Learn how to use encryption and other security settings to protect messages sent from Outlook.

A phishing email is an email that appears legitimate but is actually an attempt to get your personal information or steal your money. Some deceptive emails appear to be from a safe sender but, in fact, have a "spoofed" source address to fool you. Here are some ways to deal with phishing and spoofing scams in Outlook.com. Spoof intelligence in Exchange Online Protection helps prevent phishing ...

連絡 Microsoft 支援服務。尋找常見問題的解決方案，或向支援專員尋求協助。

If you get an email from Microsoft account team and the email address domain is @accountprotection.microsoft.com, it is safe to trust the message and open it. Microsoft uses this domain to send email notifications about your Microsoft account. These notifications can include security codes for two-step verification and account update information, such as password changes. You can check the ...

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 ...