Windows devices may get new functionality at different times as Microsoft delivers non-security updates, fixes, improvements, and enhancements via several servicing technologies—including controlled feature rollout (CFR) . Windows will let you know if you need to restart your device to complete an update, and you can choose a time that works best for you to complete that update.

DATEVALUE 函数将存储为文本的日期转换为 Excel 识别为日期的序列号。 例如，公式 =DATEVALUE ("1/1/2008") 返回 39448，即日期 2008-1-1 的序列号。 即使如此，请注意，计算机的系统日期设置可能会导致 DATEVALUE 函数的结果会与此示例不同。

There are many ways to shut down your PC—you can turn the PC off completely, you can make it sleep, or you can hibernate the PC.

Aanmelden bij Hotmail of Outlook.com. Hotmail is nu Outlook.com. Als je je wilt aanmelden bij Hotmail, heb je de gebruikersnaam en het wachtwoord van je Microsoft-account nodig. Selecteer bij het aanmelden Ja bij de prompt Aangemeld blijven? als je de volgende keer rechtstreeks naar je postvak wilt gaan (niet aanbevolen voor gedeelde computers ...

若要将其关闭，请将设置切换为“ 关闭 ”。 关闭 Microsoft Defender 防火墙可能会使设备（以及网络，如果有）更容易受到未经授权的访问。 如果有某个需要使用的应用被阻止，则可允许它通过防火墙，而不要关闭防火墙。 获取打开或关闭 Windows Defender 防火墙的相关步骤。

Outlook.com、Hotmail、Live、または MSN のメール アカウントにサインインできない場合、サインインまたはサインアウトする方法がわからない場合は、次の解決策を試してください。

Learn how to download Microsoft Support and Recovery Assistant to help fix problems with Microsoft 365, Office, or Outlook.

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.

You might also see another check box displayed: Help improve battery by optimizing the content shown and brightness. Some Windows PCs can automatically adjust the screen brightness and contrast based on content that’s displayed on your built-in screen. For more info, see Adaptive brightness and contrast in Windows .

Learn how to update drivers in Windows using Device Manager to update or reinstall a driver.