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

Want to add a padlock to your email messages? You can use S/MIME in Outlook on the web to increase the security of messages. A digitally encrypted message can only be opened by recipients who have the correct key.

可移植文档格式 (PDF) 是用于共享最终版本文件的一种通用格式。 若要在通过 Office 程序（如 Excel 或 Publisher）创建的 PDF 中添加或编辑文本，请首先从原始 Office 文件开始着手。

Hotmail 現在為 Outlook.com。 瞭解如何登入以存取您的 Outlook.com、Hotmail、Live 或 MSN 電子郵件帳戶。

Need to uninstall Office for Mac? It's quick and easy. Just follow these simple steps.

Microsoft Edge comes with built-in accessibility options such as making text larger, having the web read aloud to you, keyboard shortcuts, and more.

Training: How to save and upload files and folders to OneDrive in your browser or on your desktop.

A workbook is a file that contains one or more worksheets to help you organize data. You can create a new workbook from a blank workbook or a template. By default, a new workbook contains three worksheets, but you can change the number of worksheets that you want a new workbook to contain. You can also add and remove worksheets as needed.

An icon is added to the right of your Address bar, letting you sign in and customize the extension. To change your My Apps portal using the extension

When Microsoft Excel detects a corrupted workbook upon opening, it automatically starts File Recovery mode and attempts to repair the workbook.