Here's a macro that can be used to sort the datasource to achieve that:

' Macro to assign numbers to data source so that it can be sorted to cause
labels to print down columns
Dim Message, Title, Default, labelrows, labelcolumns, i As Integer, j As
Integer, k As Integer
Message = "Enter the number of labels in a row" ' Set prompt.
Title = "Labels per Row" ' Set title.
Default = "3" ' Set default.
' Display message, title, and default value.
labelcolumns = InputBox(Message, Title, Default)
Message = "Enter the number of labels in a column" ' Set prompt.
Title = "Labels per column" ' Set title.
Default = "5" ' Set default.
labelrows = InputBox(Message, Title, Default)
ActiveDocument.Tables(1).Columns.Add
BeforeColumn:=ActiveDocument.Tables(1).Columns(1)
ActiveDocument.Tables(1).Rows(1).Range.Cut
k = 1
For i = 1 To ActiveDocument.Tables(1).Rows.Count - labelcolumns
For j = 1 To labelrows
ActiveDocument.Tables(1).Cell(i, 1).Range.InsertBefore k + (j - 1) *
labelcolumns
i = i + 1
Next j
k = k + 1
i = i - 1
If k Mod labelcolumns = 1 Then k = k - labelcolumns + labelcolumns *
labelrows
Next i
ActiveDocument.Tables(1).Sort FieldNumber:="Column 1"
ActiveDocument.Tables(1).Rows(1).Select
Selection.Paste
ActiveDocument.Tables(1).Columns(1).Delete

Alternatively, if you modify the mailmerge main document so that the labels
are in columns (FormatColumns) you can achieve the same thing.

--
Hope this helps.

Please reply to the newsgroup unless you wish to avail yourself of my
services on a paid consulting basis.

Doug Robbins - Word MVP

"vcloos" wrote in message
...
After completing mail merge in Word 2000 - need to print the labels,
alphabetically sorted , so the labels are sorted vertically instead of
horizontally?????