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

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

You can view your XBOX purchase history on your XBOX console or the web. Use the steps below to review your info or get help with a charge that you don’t recognise.

Learn how to fix error 0x91d7000a so you can load a Blu-Ray Disc on your Xbox One console.

2026 年 5 月 26 日の Windows 11 Version 25H2 用更新プログラムには、.NET Framework 3.5 および 4.8.1 のセキュリティと累積的な信頼性に関する機能強化が含まれています。 この更新プログラムは、定期的な保守ルーチンの一部として適用することをお勧めします。 この更新プログラムをインストールする前 ...

About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.

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.

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 ...

查找管理 Microsoft 帐户、Xbox 档案等所需的一切。

Learn how to check if your PC is capable of running TPM 2.0 or how to enable TPM 2.0 to upgrade to Windows 11.