Internet Explorer 11 support ended on June 15, 2022. Switch to Microsoft Edge for a faster, more secure and more modern web browsing experience.

Internet Explorer 11 support ended on June 15, 2022. If any site you visit needs Internet Explorer 11, you can open it with Internet Explorer mode in Microsoft Edge.

若要计算两个日期之间的差值，请使用 DATEDIF 函数。 首先将开始日期放入一个单元格，并将结束日期置于另一个单元格。 然后键入一个如下所示的公式。

パスワードを忘れてリセットする必要がある場合は、Windows サインイン画面からパスワードをリセットできます。 デバイスに複数のアカウントがある場合は、リセットする必要があるアカウントを選択します。

Make text, images, and apps bigger on the screen of your Windows computer.

See a list of options available for starting Windows in diagnostic modes such as safe mode.

Learn how to upgrade from Windows 10 Home to Windows 10 Pro or Windows 11 Home to Windows 11 Pro, including how to use a valid product key or the Microsoft Store.

Learn Excel skills from beginner to advanced with video tutorials, templates, and tips from Microsoft Support.

Download the latest Windows update from the Windows Update page in Settings for your device when it becomes available.

Creating a passkey. To create a passkey for your Microsoft account, follow these steps on the device for which you’d like to create a passkey: