Try these solutions if sent messages in Outlook.com come back with a "delivery failed" error.

Learn how to open an encrypted email in Outlook, Outlook on the web, or read a protected message with a single-use code.

In Microsoft Forms, you can send forms and quizzes to students, parents, and colleagues to collect form responses.

Your Microsoft account dashboard is where you can manage your personal information and security settings, keep tabs on your subscriptions and order history, and manage your payment and billing options.

了解如何管理 Microsoft 帐户安全信息和排查验证码问题。

Learn how you can use the free Microsoft Authenticator app to sign in to all your accounts without using a password.

Learn how to use the privacy dashboard in your Microsoft account and manage your privacy settings for products you use.

Learn what to do if you find charges you don't recognize from Microsoft.

Find out what steps you can take if an incompatible driver in preventing you from turning on the Memory integrity setting in Windows Security.

With External Access for Teams, you can add or invite anyone outside of your Teams org who uses Teams, Teams for personal use, Skype (for consumers), and Skype for Business to a one-to-one chat.