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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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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Find out how to order custom toppers for the Xbox Wireless Controller, Xbox Elite Wireless Controller Series 2, or the Xbox Adaptive Joystick.

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 ...

Hotmail is now Outlook.com To sign in to Hotmail, you'll need your Microsoft account username and password. Sign in at outlook.live.com

Check the Xbox services, games, and apps for any service outages.

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Microsoft is modernizing the activation experience for perpetual licenses. Beginning December 3, 2025, the traditional telephone-based product activation automation process has been moved from telephone to online. Customers will instead use the Product Activation Portal: Product Activation Portal The new digital workflow provides a more secure, reliable, and user‑friendly activation ...

Find out how to change your Xbox gamertag through a browser, on your Xbox console, or your Windows device.

Keeping your Surface up to date helps it perform at its best. In addition to software updates for Windows, it's also important to install hardware updates—these include drivers and firmware. Each Surface device is eligible to receive new driver and firmware updates until its end-of-servicing date listed in Surface devices driver and firmware lifecycle for Windows-based devices. You can ...