2010 Excel template needs to be fixed for 2003

[Bellaness]

Is there anyone that can help me fix the attached file to work in Excel 2003?

[Søren Larsen]

Have a look at the attached. I changed your =IFERROR()s to =IF(ISERROR())s and your =SUMIFS()s to =SUMPRODUCTS()s.

[Bellaness]

Thank you for your help.
Do you know how to highlight selected dates in the calender, the same way as in the image I attached?

[royUK]

The highlighting is done with conditional formatting. Where's the original workbook for 2007, there might be more conditions in it than earlier versions can handles.