The biggest issue you'll find is the maximum worksheet size of 65536 rows by 256 columns in 2003.
For example, if I'm looking for the last row of data in 2007 or later I'll use:
however, in 2003, the above would error as out of range.
2003 version:
However, there will be plenty more. Without seeing your workbook, it's very difficult to judge. When you say the macros will not work.....do you get an error message? If you click 'debug' does a line of code become highlighted in yellow?
Gimme a clue here....
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