Learn how to change Internet Explorer settings, or reset browser settings when there's a problem.

You weren't able to find your username. If the username lookup wasn't successful, try looking for your Microsoft account username within other products or services that you know are associated with that account.

Using Authenticator as a way to sign in. If you have turned on passwordless, two-step, or multi-factor authentication for your account, use the following steps to sign-in:

Training: Watch and learn how to use PowerPoint in Windows. Explore PowerPoint training guides, articles, and how-to videos.

This article answers common questions about Microsoft Authenticator. Select the headings below to see more information.

Change two-step verification settings; Common problems with two-step verification for work or school accounts; Manage app passwords for two-step verification

Using pages is a great way to share ideas using images, Excel, Word and PowerPoint documents, video, and more.You can create and publish pages quickly and easily, and they look great on any device.

即使已开启其他防火墙，开启 Microsoft Defender 防火墙也很重要。 它保护你免遭未经授权的访问。 若要打开或关闭 Microsoft Defender 防火墙，请执行以下操作：

Outlook Data Files contain your email messages, calendar, tasks, and other items on your computer.

Learn how to download, install, and configure Language Accessory Packs for Microsoft 365 for additional display, help, and proofing tools.