Learn how to activate Windows using an internet connection, automated system, or live support advocate.

了解如何安装 Windows 7 Service Pack 1 (SP1)。 包含有关如何获取下载、要求和其他内容的信息。

To edit a PDF, open it in Word. This works best with PDFs that are mostly text. PDFs of book chapters or something that looks like a manuscript from a copier won't be formatted well in Word.

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

Training: Get started with SharePoint in Microsoft 365. At office.com, sign in to SharePoint, then select the SharePoint tile.

Look in the Surface app. The easiest way to find which Surface model you have is to use the Surface app. It shows the model name of your Surface device and each Surface accessory.

Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

Learn how to join a Microsoft Teams meeting by link, calendar, channel, chat, or by calling in.

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

A workbook is a file that contains one or more worksheets to help you organize data. You can create a new workbook from a blank workbook or a template. By default, a new workbook contains three worksheets, but you can change the number of worksheets that you want a new workbook to contain. You can also add and remove worksheets as needed.