Sort Macro not working in 2003 (but ok in 2007)

Can anyone explain why this macro is working fine in 2007 and not in excel 2003:

Range("A1:C200").Select
    Range("C200").Activate
    ActiveWorkbook.Worksheets("#Client List").Sort.SortFields.Clear
    ActiveWorkbook.Worksheets("#Client List").Sort.SortFields.Add Key:=Range( _
        "A1:A200"), SortOn:=xlSortOnValues, Order:=xlAscending, DataOption:= _
        xlSortNormal
    With ActiveWorkbook.Worksheets("#Client List").Sort
        .SetRange Range("A1:C200")
        .Header = xlGuess
        .MatchCase = False
        .Orientation = xlTopToBottom
        .SortMethod = xlPinYin
        .Apply
    End With
    Range("D1").Select

thanks

yeah that's a shame. i guess its time to upgrade some of our software

Had the same issue last week. Had my client upgrade to 2007 and now it works perfectly.

well it was something in the pipeline for while, we wanted all users to have a uniform office for other reasons, inlcuding Outlook.