**MyndSurfers**May 7, 2013 5:55 PM

I wish to know EXACTLY which functions I use in a Numbers sheet WILL FAIL to export correctly to an Excel or Neoffice spreadsheet.

For instance, I created a Numbers spreadsheet using prolific use of the IFERROR function. However, when I EXPORT to XLS, all the cells that used the IFERROR function were replaced by the literal value of the cell. My IFERROR formulae were not EXPORTED as I had expected.

I note that some formulae were converted correctly in my EXPORTED spreadsheet: eg MAX, MIN, AVERAGE.

I understand that IFERROR was a function introduced recently to Excel, ie in the 2007 version. Consequently, I suspect that Numbers exports to a pre-2007 version of Excel. If so, which version?

I have found this list that shows which functions are compatable amongst various versions of Excel:

Excel Functions: Compatibility Reference (2010, 2007 & 2003). (n.d.). Retrieved from https://docs.google.com/spreadsheet/ccc?key=0AsHau4_IeCfwdG45c0VhcjBBUGNreVo2ZzN NRU1BT0E#gid=0

This list shows that, for instance, IFERROR exisits inb both Excel 2007 and Numbers-09. So why is IFERROR not exported?

Curmi, J. (n.d.). Summary of function in excel and numbers-09. Retrieved from http://curmi.com/blog/wp-content/uploads/2009/01/functions-in-excel-and-numbers- 09.pdf

Some examples of my use of ISERROR in Numbers are as follows:

=IFERROR(RANK(C47,$C47:$J47,1),"")

=IFERROR(MEDIAN(C51:C58),"")

=IFERROR($C32-C88+1,"")

I use the above function to carry out the calculation ONLY IF a cell is non-blank and contains a number.

## More questions

What are the rules that Numbers uses to convert to Excel?

Is Numbers converting to the 2003 version of Excel? ... or an earlier version? ... which version?

Why desn't Numbers advise me there were conversion errors or simplifications made?

eg: "Cell A33 Function IFERROR was exported to the cell value for Excel"

Is there a preference that I can select which version of Excel that Numbers will export to?

In the meantime, I must abandon Numbers and use NeoOffice!