The Excel _xlfn. prefix indicates that your workbook contains a function that is not supported by your version of Excel.

This is a common error you many receive, especially is someone sends you a spreadsheet. Most corporate computers do not contain the most recent version of Excel.

Unfortunately, if you see this error, the workbook will not work correctly. You can obviously rewrite the formula with something compatible.

_xlfn. prefix

Here are list of Functions not supported in Versions earlier than Excel 2007

Function not supported in Excel versions in 2019

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MAX Function

The Excel MAX function returns the largest numeric value in a range of values. The MAX function ignores empty cells,

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NETWORKDAYS Function

The NETWORKDAYS function in Excel allows you to return the number of workdays between two specified dates. This function automatically

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