Create an address book in Outlook 2013 or Outlook 2016 to look up and select names, email addresses, and contact groups when you send email.

Note: If you don’t see the Change link, it may be because some information, such as your name, photo, or title, is collected from systems that your IT or human resources department control.If you want to update those details, contact your administrator. If you need help finding your administrator, see How do I find out who my admin is?

了解如何从 Windows 10 家庭版升级到 Windows 10 专业版或从 Windows 11 家庭版升级到 Windows 11 专业版，包括如何使用有效产品密钥或 Microsoft Store。

Learn how to concatenate text strings in Excel using the CONCATENATE function. Our step-by-step guide makes it easy to join two or more text strings into one.

Learn how to manage background activity for apps to help save battery power in Windows.

If you don't already have an Xbox profile, we can help you create one using an existing email address (or if you prefer, you can create a new email address specifically for signing in to Xbox):

Open the Start menu, then right-click the app you want to pin. Select Pin to Start or Unpin from Start.

Learn how to troubleshoot Windows sign in issues, including problems signing in to your Windows device after upgrading.

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

Learn more about submitting a case review appeal when you want more info about an enforcement action.