Designed by media lovers for media lovers. Windows Media Player 12—available as part of Windows 7, Windows 8.1, and Windows 10*—plays more music and video than ever, including Flip Video and unprotected songs from your iTunes library!

At Microsoft, we're guided by our AI principles, our Responsible AI Standard, and decades of research on AI, grounding, and privacy-preserving machine learning.Data privacy and security is a key principle of responsible AI. We aim to help our customers use our AI products responsibly, sharing our learnings, and building trust-based partnerships.

Learn how to download, install, and use the PC Health Check app to check your device's compatibility with Windows 11 and get tips to improve its performance.

Problem. Description. 0 (Zero) is shown instead of the expected result. Make sure Criteria1,2 are in quotation marks if you are testing for text values, like a person's name.. The result is incorrect when Sum_range has TRUE or FALSE values.. TRUE and FALSE values for Sum_range are evaluated differently, which may cause unexpected results when they're added. ...

Disable all macros except digitally signed macros This setting is the same as the Disable all macros with notification option, except that if the macro is digitally signed by a trusted publisher, the macro can run if you have already trusted the publisher. If you have not trusted the publisher, you are notified. That way, you can choose to enable those signed macros or trust the publisher.

查找有关 Windows 操作系统的帮助和操作方法文章。 获取对 Windows 的支持，并了解安装、更新、隐私、安全等方面的信息。

Important: If you want to delete the last or the only email account you have in classic Outlook for Windows, you'll receive a warning that you must create a new location for your data before removing the account.For more information, see Create an Outlook Data File.

Get Microsoft billing support. Find help with Microsoft Store purchases, subscriptions, refunds, payment options, and checking your order history.

注销 Office 后，你可以断开与 OneDrive 之类的服务的连接，删除设置并清除常用文档列表。 可以从任何 Office 应用内注销 Office。 也可以 使用 Web 浏览器 远程注销 Office。

在任务栏上的搜索框中，键入“管理 BitLocker”，然后从结果列表中选择它。或者，你可以选择“开始” 按钮，然后在“Windows 系统”下选择“控制面板”。 在“控制面板”中选择“系统和安全”，然后在“BitLocker 驱动器加密”下选择“管理 BitLocker”。 注意：仅当设备配备 BitLocker 时才会显示此选项。