I'll go with the Array please. Only because I think it may help to learn how best to use an array, I'm sure this will come in handy a lot. I've tried to create a version below, but it still doesn't work. Loads a two column listbox, just no data inside it... =\
Dim i As Integer
Dim data(1 To 500, 1 To 2)
For i = 1 To 500
data(i, 1) = Sheets("pgs_CustomerList_Unique").Range("D2:D502").Value
Next i
For i = 1 To 500
data(i, 2) = Sheets("pgs_CustomerList_Unique").Range("F2:F502").Value
Next i
ListBox2.ColumnCount = 2
ListBox2.List = data
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