将 Windows 家庭版升级到 Windows 专业版 - Microsoft 支持
了解如何从 Windows 10 家庭版升级到 Windows 10 专业版或从 Windows 11 家庭版升级到 Windows 11 专业版，包括如何使用有效产品密钥或 Microsoft Store。
Find out when your Microsoft 365 subscription expires
Use this article to find out your expiration status.
Applies To:
Excel for Microsoft 365, Word for Microsoft 365, Outlook for Microsoft 365, PowerPoint for Microsoft 365, Excel for Microsoft 365 for Mac, Word for Microsoft 365 for Mac, Outlook for Microsoft 365 for Mac, PowerPoint for Microsoft 365 for Mac, Microsoft 365 for home, Microsoft account dashboard, Office.com
Can't send or receive email in Outlook.com - Microsoft Support
Learn how to fix Outlook.com email sync issues if you can't receive or send messages.
Applies To:
Outlook.com
Microsoft Support
Microsoft Support offers assistance for Microsoft products, including how-to articles, videos, and training for various software and devices.
Change the sound played when an email message arrives
When a new message arrives in Outlook, a short sound plays. The sound can be turned off or changed to any .wav audio file on your computer. Change the sound in Windows using Control Panel.
Applies To:
Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016, Outlook 2013, New Outlook for Windows
Windows Update-Problembehandlung - Microsoft-Support
Erfahren Sie, wie Sie die Windows Update-Problembehandlung ausführen, um Fehler beim Herunterladen oder Installieren von Windows zu beheben.
Manually add an account to the Microsoft Authenticator app
If your camera is unable to capture the QR code, you can manually add your account information to the Microsoft Authenticator app for two-factor verification.
在 Microsoft Edge 中管理 Cookie：查看、允许、阻止、删除和使用 - Microsoft 支持
Microsoft Edge 允许阻止来自特定网站的 Cookie，但这样做可能会阻止某些页面正确显示，或者你可能会从某个站点收到一条消息，告知你需要允许 Cookie 查看该网站。
Applies To:
Microsoft Edge
Beheben von WLAN-Verbindungsproblemen in Windows
Behandeln von Netzwerkproblemen in Windows. Wenn Sie keine E-Mails erhalten, im Web surfen oder Musik streamen können, sind Sie wahrscheinlich nicht mit Ihrem Netzwerk verbunden und können nicht ins Internet gelangen.
Windows 8.1 RT Update 3 - Microsoft Support
What's new in Windows 8.1 RT Update 3? Windows 8.1 RT Update 3 includes improvements to the Windows desktop experience for Surface RT and Surface 2.