Get started with Microsoft Teams (free). Explore your options, find out what’s new, browse help topics, and more.

Teams in Microsoft Teams are collections of people, content, and tools surrounding different projects and jobs.

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

Learn how to set up Microsoft Family Safety to manage screen time, filter content, and share location with your family members.

Get Microsoft billing support. Find help with Microsoft Store purchases, subscriptions, refunds, payment options, and checking your order history.

若要下载 Internet Explorer 11 的脱机安装程序，请选择下面的语言和系统。

Keeping leading zeros and large numbers in Excel. Use a custom format to keep the leading zeros. If you want to resolve the issue just within the workbook because it's not used by other programs as a data source, you can use a custom or a special format to keep the leading zeros.

Find out how to submit a case review and learn more about your Xbox enforcements.

If you don't recognize a charge on your account, go to the Manage your payments page of your Microsoft account dashboard and select "Investigate". Learn more.

Learn how to design professional-looking presentations with Microsoft 365. Create high quality, customized slides in a few clicks with PowerPoint Designer.