Learn how to access Windows device security settings in Windows Security to help protect your device from malicious software.

Find your Wi-Fi network password in Windows, so you can connect to your Wi-Fi network on other devices.

Check your network connection status in Windows. Windows 11 lets you quickly check your network connection status. Select the Start button, then type settings.Select Settings > Network & internet.The status of your network connection will appear at the top.

使用 vlookup、hlookup 和其他函数（如 index 和 match）根据您输入的值搜索和查找数据。 本文将让您快速回顾 vlookup，然后链接到更多内容。

Open Device Manager. By pressing submit, your feedback will be used to improve Microsoft products and services.

Decide which documents to recover from an unexpected close, delete recovered files you don't want, or close recovered files to review later.

Get help with using mail, calendar, and contacts on Outlook.com.

If you cannot open your Outlook data file or suspect that the file is damaged, use the Inbox Repair tool (scanpst.exe) to repair errors in the file.

Learn how to find and install digital downloads from Microsoft Store. See instructions to download and install software directly purchased from Microsoft.

Find answers to frequently asked questions about Office 2021 and Office LTSC for Windows and Mac on the official support page.