Comparing Lists [RESOLVED]

I have 56 string lists which need to be compared [2 each of 28 types]. One represents an old list and one an updated list. Each list can contain hundreds of items and I am trying to determine ONLY the values of the items in the updated list that are NOT present in the old lists.

Each list is a column in an Excel spreadsheet. Haven't found the right Excel function to fit. Would appreciate any assistance someone might provide.

There may be a complex Excelfunction that fits, but if you are only talking hundreds, this should do the trick. Assuming master list is in column A and new list is Column B, this puts "X" in Column C for each case where item in B is not in A.

VB Code:

For i = 1 To ActiveSheet.Cells.SpecialCells(xlLastCell).Row
    If Columns("A:A").Find( _
            What:=Range("B" & i).Value, _
            After:=Range("A1"), _
            LookIn:=xlValues, _
            LookAt:=xlPart, _
            SearchOrder:=xlByColumns, _
            SearchDirection:=xlNext, _
            MatchCase:=False) Is Nothing Then
        Range("C" & i).Value = "X"
    End If
Next i

:)

Hey, thanks for your reply. Looks like good code. Will try iy out. Already solved prob with a short macro that put old values in array, compared new values to array and then wrote unique values to a new list.