I have a spreadsheet that worked fine in XL2003 using the ATPVBAEN.XLA
Analysis ToolPak, but now that our local IT department have forced us all to
"upgrade" to XL2007 SP1 it has stopped working because it can't find the
Yield() function from the new XL2007 ATPVBAEN.XLAM version of the ToolPak.

Using the Object Browser confirms that the function is no longer there.

However, if I deregister the new XLAM and register the old XLA file, the
Yield() function appears back in the Object Browser and the spreadsheet
compiles OK, BUT I now get unsolvable "Error 2015 - Type Mismatch" errors.

(After some Googling, I have tried to ensure the date format is correct for
the first 2 parameters but the Error 2015 will not go away from the XL2007
run whatever I do).

Can anyone help?