Learn about Windows service packs and download the latest updates for Windows 10 and Windows 8.1

了解在 Windows 中查找 BitLocker 恢复密钥的不同方法，并了解如何在系统上激活 BitLocker。

Use the new Outlook for Windows for coordinated Mail, Calendar and People apps on Windows 11.

How to add and request read receipts and delivery notifications in Outlook.

Windows 10とWindows 11でエクスプローラーを検索して開き、ファイルとフォルダーをピン留めして削除することでクイック アクセスをカスタマイズします。

Learn how to troubleshoot Windows activation errors. Browse common activation errors and learn what you can do to fix them.

Learn how to use VLOOKUP, INDEX, or MATCH to search for data in Excel. Get a quick refresher and more tips from Microsoft Support.

Learn how to set up your user account for multifactor authentication with Microsoft 365.

Learn how to open and run DxDiag.exe on Windows to collect device information and troubleshoot DirectX sound and video issues.

You can insert a drop-down list of valid entries (also called a drop-down menu or drop-down box) in Excel to make data entry easier, or to limit entries to certain items that you define.