When prompted, enter the product key. You can find the product key on the sticker on the CD case or other packaging. If you need help, see Find your Product Key for Office 2007.

Check the Xbox services, games, and apps for any service outages.

若要在 Outlook.com 中获取支持，请单击此处或选择菜单栏上的帮助，然后输入查询。 如果自助服务无法解决问题，请向下滚动到“仍需要帮助？”，然后选择“是”。 若要在 Outlook.com 中联系我们，需要登录。

Learn how to manage extensions in Microsoft Edge, including adding, disabling, or removing them as needed.

Learn how to run Windows Update Troubleshooter to resolve errors downloading or installing Windows updates.

In the Windows emoji picker, you can either scroll through the list, use the category icons at the top or bottom of the emoji picker, or type a keyword to search for the emoji you want.

To pin Quick Assist to your taskbar so you can quickly get back to it, after Quick Assist is open, right-click (or press and hold) the icon on your taskbar > Pin to taskbar. If the old app icon still appears on your device, make sure you select the new app icon.

Note: If you signed in with a Microsoft account such as an Outlook.com, Hotmail, Live, or MSN email account instead of your work or school account, sign out, and then sign in again using the correct account. Not sure which account you're signed in with? Select Account manager in the Outlook navigation header. If you're not signed in with the account you want, select Sign out and start the ...

Select Settings, and under the About section, select About Photos. Photos: Says Updated in the About section of Settings—you are running the new version of the Photos app.This version includes features like iCloud integration in left navigation bar. This version of Microsoft Photos app offers a convenient and user-friendly way to view, import, organize, edit, and share photos and videos on ...

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。