How to use an Excel spreadsheet with mail merge in Word to create mailing lists for labels, envelopes, and documents.

If you’re having problems getting connected to a network and can’t get onto the Internet, here are some things you can try in Windows.

Learn about what effect closing a Microsoft account might have on your other apps and services.

从确保设备可以运行 Windows 11 到备份文件和安装 Windows 11，了解如何为 Windows 11 升级做好准备。

How to use the SUM function in Excel to add individual values, cell references, ranges, or a mix of all three.

The dialog that appears varies depending on whether you had the Add Apps or Get Add-ins option available to you. If you selected Add Apps, the Apps dialog appears. If you selected Get Add-ins, the Add-Ins for Outlook dialog appears. Search for the add-in you want from the available list.

Explore OneDrive support, help, and learning resources. Learn how to protect your important files, documents, and memories with OneDrive.

Training: Get up and running quickly with our Outlook Quick Start. Learn how to add an email account and get started in Outlook.

Learn how to download, customize, and troubleshoot Windows Media Player 12 with helpful guides and tips.

Learn how to tell if your Office software is genuine. To help determine if your Microsoft software is genuine, go to our How to Tell site for more information. Here you'll learn about authentic packaging, including what to look for with product key labels, and Certificate of Authenticity (COA), how to report counterfeit software, and find out what your shopping and licensing options are.