Learn how to access Windows device security settings in Windows Security to help protect your device from malicious software.

To change your profile picture in Microsoft Teams, click your existing profile picture and select the camera icon.

Learn how to fix Outlook.com email sync issues if you can't receive or send messages.

了解如何使用 PIN、面部识别或指纹通过 Windows Hello 登录电脑。

Verwenden Sie Ihr Microsoft-Konto, um sich bei Microsoft-Diensten wie Windows, Microsoft 365, OneDrive, Skype, Outlook und Xbox Live anzumelden.

Learn how to take control of your chat list with options to hide a chat or mute notifications from it. Keep track of important chats by pinning them.

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.

Learn how teamwork and communication happen in channels. A channel is a single place for a team to share messages, tools, and files in Microsoft Teams.

Learn how to share documents, links, and pictures with nearby devices using Bluetooth or Wi-Fi in Windows.

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.