Currently Excel offers about 475 standard functions and new ones are added regularly. Most of these functions are rock-solid, but a couple of them we consider vulnerable functions. Some of which are frequently used by many Excel professionals. We suggest you try to avoid using them. Excel offers a range of fine alternatives.
Risks of vulnerable functions
Vulnerable functions are Excel functions that are unreliable in one way or another. They slow down your spreadsheet, aren’t updated automatically or may corrupt your spreadsheet as time passes or when it is transferred to other users with different versions of Excel.
Numeric Index Reference
Functions that accept a number as (part of a) cell reference are risky, because Excel doesn’t update them when columns/rows are inserted or deleted. For example in a VLOOKUP function: when columns are inserted or removed, failing to update the column reference argument will typically yield incorrect results. This is why PerfectXL marks them as vulnerable functions.
Deprecated may indicate that the feature will be removed in the future. Certain functions in Excel are supported for backwards-compatibility, but should no longer be used. Try to replace the function with the new equivalent function. PerfectXL Risk Eliminator will suggest this equivalent.
Recent function indicates that the function will replace a previous function. Using functions that are only supported in the latest few versions of Excel make the spreadsheet less transferable. Don’t use recent functions when you are sharing the workbook with users that have older versions of Excel (and if you are not sure, just don’t take the risk).
A volatile function is recalculating the formula every time a change in the spreadsheet is made. This results in reduced performance and makes the spreadsheet slow. Check if the volatile function exists intentional or by accident.