Learn how to type a letter online using Word for the web. Choose a letter template for online letter writing. Edit, send or print your letter online.

The CONCAT function combines the text from multiple ranges and/or strings, but it doesn't provide delimiter or IgnoreEmpty arguments.

了解如何使用产品密钥或数字许可证激活 Windows、检查激活状态，以及链接Microsoft 帐户。

Learn how to use digital signatures, digital IDs, and signature lines in Microsoft 365 files, such as Word, Excel, and PowerPoint.

Training: With OneDrive, you can securely store your pictures and files, share and collaborate with others, and get to your files from anywhere - on your computer, laptop, tablet, or phone.

Apprenez à activer Windows à l'aide d'une clé de produit ou d'une licence numérique, à vérifier l'état de votre activation et à lier votre compte Microsoft.

Installer Microsoft 365 pour la première fois. Certains produitsOffice 2019, Office 2016, et Office 2013 sont fournis avec une clé de produit.

Use the XLOOKUP function when you need to find things in a table or a range by row. For example, look up the price of an automotive part by the part number, or find an employee name based on their employee ID. With XLOOKUP, you can look in one column for a search term, and return a result from the same row in another column, regardless of which side the return column is on.

Learn how to concatenate text strings in Excel using the CONCATENATE function. Our step-by-step guide makes it easy to join two or more text strings into one.

Microsoft removed the ability to connect new third-party accounts such as a Gmail account and sync existing connected accounts from within Outlook.com.