Learn how to download and install apps you need from your Microsoft 365 business subscription.

Learn how to locate your Microsoft Office product key, which allows you to activate and use your Office products without requiring a Microsoft account.

Sign in to SharePoint. SharePoint is a browser-based app that you connect to through your web browser, like so: Go to office.com, and sign in to your work or school account. In the upper left corner of the window, select the app launcher > All apps > SharePoint. Tip: If you don't see the SharePoint app under All apps, use the Search box near ...

If you’re having sound or audio problems, the following suggestions might help. The tips are listed in order, so start with the first one, see if that helps, and then continue to the next one if it doesn’t.

Learn how to switch out of S mode to install apps from outside of the Microsoft Store or to upgrade to Windows 11.

Learn how to troubleshoot Bluetooth problems in Windows. Resolve issues connecting a Bluetooth device or accessory.

PC Health Check app brings you up to date info on your Windows device health, helping you take action to improve your device performance and troubleshoot performance problems. It is periodically updated based on customer feedback to help you make the most of your Windows PC.

但如果需要测试多个条件，例如我们假设所有条件都需要为 True 或 False ( AND )，或只有一个条件需要为 True 或 False ( OR )，或者如果想要检查某个条件是否不 ( NOT) 符合你的条件，这时该怎么做呢？ 这三个函数均可以单独使用，但它们更常见于与 IF 函数成对使用。

你可以为经常使用你电脑的任何人创建本地用户帐户（脱机帐户）。 但在大多数情况下，最好的选择是使用你电脑的每个人都拥有 Microsoft 帐户 。 使用 Microsoft 帐户，你可以跨设备访问你的应用、文件、和 Microsoft 服务。 获取在 Windows 10 或 Windows 11 中创建本地用户或管理员帐户的步骤。

To adjust power and sleep settings in Windows 11, select Start > Settings > System > Power & battery > Screen and sleep.