Prevent duplicates before they happen by combining a simple function with data validation.

The Data Validation feature in Excel 2013 offers a List option to confine selections in a cell to a preconfigured series of values. This selection can further influence the values in another list ...

If you see the "This value doesn't match the data validation restrictions defined for this cell" error in Excel, this article will help you.

How to Change Data Organization in Excel. Organize your Microsoft Excel spreadsheet to view your data efficiently. Whether you need to rearrange cells or filter your data to match criteria, Excel ...

I've got an Excel 97 worksheet in which I need to validate some cells. No problem, I'll just use Data->Validate, right? Wrong. The built in validation works well enough as long as the user doesn't ...