Contact Microsoft Support. What's new. Surface Pro; Surface Laptop; Surface Laptop Studio 2

Identify guests on a team. To see if a team has any guests, just look below the heading where the team name shows up. You can tell if someone is a guest by looking anywhere their name appears—the word “Guest” appears after it.

Training: Keep your Microsoft 365 for business profile up to date so your teammates can get to know you and your skills.

Windows Media Player 适用于基于 Windows 的设备。 使用此表查找适用于你的系统的 Player 版本。 （如果你使用的是 Mac，则可以下载适用于 QuickTime 的 Windows Media 组件来播放 Windows Media 文件。

Get security info and tips about threat prevention, detection, and troubleshooting. Including tech support scams, phishing, and malware.

Method. Used for. Authenticator app. Two-factor verification and password reset authentication. Text messages. Two-factor verification and password reset authentication.

Select Review activity to check for any unusual sign-in attempts on the Recent activity page.If you see account activity that you're sure wasn't yours, let us know and we can help secure your account—if it's in the Unusual activity section, you can expand the activity and select This wasn't me.If it's in the Recent activity section, you can expand the activity and select Secure your account.

本文介绍如何获取或创建用于 Office 文档的数字签名。 若要详细了解如何在 Office 文档中使用它们，请参阅 在 Office 文件中添加或删除数字签名。. 什么是数字签名？

获得足够的积分后，符合条件的奖励将显示在“奖励”页面上。 为大项目存钱，并在此过程中将你的积分花在较小的奖励上 - 无论你想要兑换你的积分，我们和你在一起。 我们将跟踪你的积分进度，以便你可以继续赚取和支出，而无需指望你的手指。

了解如何在 Microsoft Edge 中启用 Adobe Flash。