In case you get encoding problems with EXCEL exported CSV-files, you probably need to adjust the CSV delimeter and the input encoding:
    csv2ldif2.pl -e CP850 -d ';' ...

The codeset used by your excel varies by region (OS localization) and excel version, so you probably need to search the ionternet in case the above example (or CP1250 to CP1259, or latin1) does not work.