To take advantage of the new features of Excel 2010, you can save the workbook to an Excel 2010 file format. However, you also have the option to continue to work in Compatibility Mode, which retains the original file format for backward compatibility.

If you're looking for Help on specific Excel Add-ins, such as Solver or Inquire, see Help for Excel for Windows add-ins. If you're looking for additional help with Excel add-ins using the COM Add-ins dialog box, see Add or remove add-ins in Excel. Get a Microsoft 365 Add-in for Excel.

In File Explorer under View, in the Show/hide group, select the File name extensions check box. Below is a list of common Windows file name extensions and formats. Learn what file name extensions are, which extensions are common in Windows, and how to view them in File Explorer.

This article discusses troubleshooting steps that can help resolve the most common issues when you receive an Excel not responding error, Excel hangs or freezes when you launch it, or open an Excel workbook. These types of problems may occur for one or more of the reasons listed below.

Add or remove add-ins in Excel. Add-ins provide optional commands and features for Microsoft Excel. By default, add-ins are not immediately available in Excel, so you must first install and (in some cases) activate these add-ins so that you can use them.

You can move between cells in a circular reference by double-clicking the tracer arrow. The arrow indicates the cell that affects the value of the currently selected cell. You show the tracer arrow by selecting Formulas, and then select either Trace Precedents or Trace Dependents.

Perform statistical and engineering analysis with the Analysis ToolPak. The Analysis ToolPak is a Microsoft Office Excel add-in program that is available when you install Microsoft Office or Excel.

Add or remove add-ins in Excel. Add-ins provide optional commands and features for Microsoft Excel. By default, add-ins are not immediately available in Excel, so you must first install and (in some cases) activate these add-ins so that you can use them.

Description of workbook link management and storage in Excel. Linking to other workbooks is a very common task in Excel, but sometimes you might find yourself with a workbook that has links you can’t find even though Excel tells you they exist.

Trusted documents are files that have been marked as trusted by enabling active content in them. Active content (macros, ActiveX controls, data connections, and so on) opens without the Message Bar warning after you mark the file as trusted.