Learn about adaptive brightness and contrast in Windows 11 and how to turn it on or off.

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 add Teams meetings to Outlook calendar using our step-by-step guide. Say goodbye to scheduling headaches and hello to seamless collaboration!

Learn how to create installation media for installing or reinstalling Windows 7, Windows 8.1, or Windows 10.

Learn how to customize your keyboard for a specific language or format to control which characters appear on the screen when you press the keys.

Gridlines are the faint lines that appear around cells to distinguish them on the worksheet. By default, gridlines are displayed in worksheets using a color that is assigned by Excel. Gridlines are always applied to the whole worksheet or workbook, and can't be applied to specific cells or ranges.

Newer Surface devices come with Windows 11 already installed. Other Surface devices can be upgraded from Windows 10 to Windows 11.

Xbox Game Pass Ultimate includes all Game Pass benefits, including more than 100 high-quality console and PC games. New games are added all the time, so there’s always something new to play.

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

Find out how to access OneDrive settings and pause features with the OneDrive Activity Center. Learn how to customize your cloud storage and file sharing preferences.