Warning: Excel provides the DATEDIF function in order to support older workbooks from Lotus 1-2-3.The DATEDIF function may calculate incorrect results under certain scenarios. Please see the known issues section of this article for further details.

Learn how to create and add a signature to email messages you send in Outlook.com.

As you type inside the To, Cc, or Bcc boxes, Outlook suggests recipients. The Auto-Complete List can be turned off.

Get answers to some basic questions about what two-step verification is, and how to set it up and use it to help keep your Microsoft account more secure.

Learn how to unlock your Microsoft account and resolve 'account has been locked' error message.

Learn how to redeem your Microsoft Rewards points for a huge variety of great products and sweepstakes.

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

新版 Microsoft Edge 可帮助你浏览、搜索和网上购物等。 像其他现代浏览器一样，Microsoft Edge 允许你收集特定数据（如 Cookie）并将其存储在设备上，还允许你向我们发送信息（如浏览历史记录），以便让体验尽可能丰富、快速且个性化。

Learn what to do when you see a warning message that your device does not meet Windows 11 minimum system requirements to upgrade.

Shrink the OS partition and prepare the disk for a new recovery partition. To shrink the OS, run diskpart