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 design professional-looking presentations with Microsoft 365. Create high quality, customized slides in a few clicks with PowerPoint Designer.

Look in the Surface app. The easiest way to find which Surface model you have is to use the Surface app. It shows the model name of your Surface device and each Surface accessory.

The new Microsoft Edge is based on Chromium and was released on January 15, 2020. It is compatible with all supported versions of Windows, and macOS. With speed, performance, best in class compatibility for websites and extensions, and built-in privacy and security features, it's the only browser you'll ever need.

Find out how the Windows location service works and how to change the location privacy settings.

Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

Learn how to activate Windows using an internet connection, automated system, or live support advocate.

The new Microsoft Edge helps you browse, search, shop online, and more. Like all modern browsers, Microsoft Edge lets you collect and store specific data on your device, like cookies, and lets you send information to us, like browsing history, to make the experience as rich, fast, and personal as possible.

Switch to the new Teams and experience the fastest version of Teams yet, rebuilt from the ground up. With a performance-first mindset, the new Teams is faster, simpler, and more flexible than ever before.

Outlook Data Files contain your email messages, calendar, tasks, and other items on your computer.