Hotmail is now Outlook.com. Learn how to sign in to access your Outlook.com, Hotmail, Live, or MSN email account.

Find out how to fix sound or audio problems in Windows.

If you’re working on a Windows PC and want the apps and content from another device to show on your PC screen, you’ll want to consider mirroring that device‘s screen or projecting it to your PC.

Learn how to use the PC Health Check app to help you improve your device performance.

如果是 Microsoft 365 家庭版 订阅的所有者，则可决定停止与他人共享订阅。 如果是共享 Microsoft 365 家庭版 订阅的使用者，你可能不再需要它，或者会被告知该订阅所有者已停止与你共享。 本主题说明这些的工作原理，包括某人停止共享订阅后会发生什么。

Outlook.com、Hotmail、Live、または MSN のメール アカウントにサインインできない場合、サインインまたはサインアウトする方法がわからない場合は、次の解決方法を試してみてください。

Learn how to install Office 2013 on your PC or Office for Mac 2011.

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

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

Learn different ways to locate your BitLocker recovery key in Windows, and learn about how BitLocker might have been activated on your system.