Want to add a padlock to your email messages? You can use S/MIME in Outlook on the web to increase the security of messages. A digitally encrypted message can only be opened by recipients who have the correct key.

Get help with your questions about Microsoft Teams from our how-to articles, tutorials, and support content.

We’re making some changes to Windows and Microsoft 365 that will impact Cortana users. Cortana voice assistance in Windows as a standalone app was retired in the spring of 2023.

Resolve Windows blue screen errors with tips and resources to do your own troubleshooting, or contact the Microsoft support if you need more help.

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：

Training: Learn how to get up and productive quickly with this Microsoft Teams Quick Start. Sign in to Teams, select Teams and Channels, reply to conversation threads, @mention someone, use emojis and stickers, and ask T-Bot questions.

Find out how to manage your Xbox subscriptions to request a refund or cancel a recurring payment.

Learn how to insert data from a picture with Excel - and you can use your smartphone or tablet to take the picture. Excel's powerful AI capabilities can convert your hand written or printed data into a table.

获取更改 Microsoft Edge、Internet Explorer 11、Google Chrome、Firefox 和 Safari 中的主页的步骤。

Find solutions for common issues with Game Bar on Windows, including keyboard shortcut problems.