了解如何使用产品密钥或数字许可证激活 Windows、检查激活状态，以及链接Microsoft 帐户。

Access, download, or run the Surface app and the Surface Diagnostic Toolkit to help find and solve Surface problems.

Get troubleshooting tips to fix problems with apps from Microsoft Store.

How to use the SUMIFS function in Excel, one of Excel’s math and trig functions, to add arguments that meet multiple criteria.

How to use the FILTER function in Excel to filter a range of data based on criteria you define.

Learn how to use Snipping Tool to capture a screenshot, or snip, of any object on your screen, and then annotate, save, or share the image.

Find the best time to meet with other people, send meeting requests, and book rooms or resources.

Learn how to add an app to run automatically at startup. Select the Start button and scroll to find the app you want to run at startup.

Get an overview of SharePoint. Learn about sites, lists and libraries, permissions, content types and workflows. In addition, read about some of the social features in SharePoint.

Prova de här lösningarna om du inte kan logga in på ditt Outlook.com-, Hotmail-, Live- eller MSN-e-postkonto, eller om du inte vet hur du loggar in eller loggar ut.