Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices have started expiring in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance. For details and preparation ...

You can resolve problems with Microsoft Authenticator by checking the tips in this article and reviewing some of the known errors.

Starting in April 2026, social clubs on XBOX will no longer be available. Learn about alternatives for connecting, sharing content, and coordinating with other players.

You see the following error code and message when you launch a game or an app on your XBOX console:

Follow these steps to automatically diagnose and repair problems with files and folders in Windows. These problems might include the inablility to delete files or folders from the Recycle Bin, or troubles with trying to copy, move, rename, or delete a file. Select the Download button on this page. In the File Download dialog box, click Run or Open, and then follow the steps in the File and ...

Summary Windows Update Delivery Optimization helps you get Windows updates and Microsoft Store apps more quickly and reliably. You’re in control over whether you use Delivery Optimization with the settings described in this article. How Delivery Optimization works Windows Update Delivery Optimization works by letting you get Windows updates and Microsoft Store apps from sources in addition ...

Describes the steps to take when you receive an "Outlook blocked access to the following potentially unsafe attachments" message in Outlook.

When you redeem a reward with Microsoft Rewards, you must verify your account. Microsoft Rewards offers a QR code verification option to complete redemption securely and seamlessly.

Copilot app updates bring a simpler, unified experience for personal, work, and school accounts. Learn what's changing, what's retiring, and how to prepare.

Try it! Microsoft 365 subscribers can set up automatic replies for when they are out-of-office or unavailable to respond to email.