Find out how to request a replacement for your Xbox controller.

Change your password with your email provider. See the following sections for instructions on changing your email account password for several major email providers.

Review the warranty terms, check your warranty status, and learn about the protection plans for your Microsoft device or accessory.

Learn how to install, reinstall, or activate Microsoft 365 or Office 2019 on a PC or Mac.

Microsoft is retiring the Windows legacy inbox Troubleshooters, such as Keyboard troubleshooter and Speech troubleshooter, and the Microsoft Support Diagnostic Tool (MSDT) that runs them.

查找 Microsoft Excel 帮助和学习资源。 了解如何有效使用 Excel 的指导文章、指南、培训视频和提示。

To turn it off, switch the setting to Off.. Turning off Microsoft Defender Firewall could make your device (and network, if you have one) more vulnerable to unauthorized access.

Learn how to create, join, and use a homegroup, and how to change homegroup settings.

Learn how to use an eSIM to connect your Windows PC to the internet over a cellular data connection.

Troubleshoots and fixes common issues with security and malware prevention in Windows.