Note: Excel stores dates as sequential serial numbers so that they can be used in calculations. By default, Jan 1, 1900 is serial number 1, and January 1, 2008 is serial number 39448 because it is 39447 days after January 1, 1900.

Things to try if you've purchased Copilot but don't yet see it in your Microsoft 365 apps.

本文涵盖了 Windows 中由“设备管理器”生成的错误代码。 你可能由于“设备管理器”或其他工具（如 DXDiag）报告了错误代码，而且你不知道如何解决，而访问过这篇文章。 在本文中，我们将帮助你找到你的错误代码，并提供你尝试纠正错误可能需要的建议。 遵循针对该错误代码的建议解决方法 ...

Learn how to activate Windows using a product key or digital license, check your activation status, and link your Microsoft account.

On the Insert tab, select WordArt in the Text group and pick the WordArt style you want. In the WordArt gallery, the letter A represents the different designs that are applied to all text you type. The placeholder text "Your text here" appears, with the text highlighted. Enter your own text to replace the placeholder text.

Learn how to change your presence settings to automatically wake up your Windows 11 PC when you approach.

When you export your Outlook calendar to Google Calendar, you're exporting a snapshot of the calendar. Any changes you make to your Outlook calendar won't automatically be reflected in Google Calendar. If you want to import your Google calendar into Outlook, see Import Google Calendar to Outlook. Export your calendar from Outlook In Outlook, open the Calendar, and select the calendar you want ...

Search for help on the taskbar, use the Tips app, select the Get help link in the Settings app, or go to support.microsoft.com/windows.

If you are Level 5 or higher in any classic game mode in Microsoft Solitaire Collection (Klondike, Spider, FreeCell, Pyramid, or TriPeaks), you have automatic access to Weekly Rewards.

For Windows devices, download the Microsoft 365 Copilot app from the Microsoft Store. For iOS or Android, see Get the Microsoft 365 Copilot mobile app. How to use Microsoft 365 Copilot When you launch the Microsoft 365 Copilot app or get to it from your browser at m365.cloud.microsoft you'll see a list of apps on the navigation pane.