First time, infrequent senders, or senders marked [External] - While it's not unusual to receive an email or Teams message from someone for the first time, especially if they are outside your organization, this can be a sign of phishing.Slow down and take extra care at these times. When you get an email or a Teams message from somebody you don't recognize, or that Outlook or Teams identifies ...

Find help and how-to articles for Windows operating systems. Get support for Windows and learn about installation, updates, privacy, security and more.

The full path (including the file name) is too long. The path must contain fewer than 442 characters. Shorten the name of your file or the name of subfolders in OneDrive, or select a subfolder that's closer to the top-level folder, and then try to upload the file again.

See instructions on how to add an account within Microsoft Teams (free) on your desktop and mobile devices.

New features gradually rolling out: Improvements to folder backup opt-out experience.We are updating the behavior when users turn off folder backup.

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

Learn about channels in Microsoft Teams. Standard channels are available to all team members in Teams. Most channels are standard channels. If you need a smaller, specific audience for a particular subject, you can use a private channel. Shared channels are for collaborating with people inside and outside your team or organization.

注意: 如果你在 S 模式下运行 Windows，则它经过简化，因此“ 病毒 & 威胁防护 ”区域的选项比此处所述的选项要少。 这是因为 S 模式下 Windows 的内置安全性会自动阻止病毒和其他威胁在你的设备上运行。

注意: 如果设备上发现兼容性问题会中断使用 Windows 11 的体验，我们会暂时延迟升级，直到问题得到解决。兼容性保障措施有助于确保在升级时获得最佳体验，并且当关键应用或驱动程序尚不兼容时，工作效率不会中断。

步骤 1：转到 www.microsoftstore.com 并使用用于购买 Office 的 Microsoft 帐户登录（右上角）。. 步骤 2：登录后，在右上角选择姓名，然后选择“订单历史记录”。. 步骤 3：找到 Office 一次性购买或单独的 Office 应用，然后选择“安装 Office”，查看产品密钥（此操作不会安装 Office）。