Learn how to activate Windows using a product key or digital license, check your activation status, and link your Microsoft account.

Find and open File Explorer in Windows, and customize Quick access by pinning and removing files and folders.

Describes how to use the System File Checker tool to troubleshoot missing or corrupted system files in Windows.

Learn how you can free up drive space in Windows. Keep your PC running smoothly and up to date by increasing the disk space.

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

Learn how to redeem a gift card, code, or Office product key and spend your balance at Microsoft Store online, on Windows, or Xbox.

注意 你的 Hotmail 或 Outlook.com 密码与你的 Microsoft 帐户密码相同。 如果可以登录但 Outlook.com 出现问题，检查 服务状态。 如果状态不是绿色，请等到服务正常运行再重试。 Microsoft 始终保持留意异常的登录活动，以防其他人试图登录到你的帐户。 如果您在去新地方的旅途中或使用新的设备，我们可能 ...

Learn how to install Office 2021, 2019, or 2016 on your PC or Mac.

Learn how to use the taskbar features in Windows. Hide the taskbar, pin an app, change the location, and more with taskbar settings.

Learn what a correlation ID is and is not. While it isn't an error code, it can help SharePoint administrators find how an error or problem occured.