Execute the mail merge to a new document and then use the
following macro to send that document to the printer:
Dim i As Long
With ActiveDocument
For i = 1 To .Sections.Count
.PrintOut Background:=False, Range:=wdPrintFromTo, From:="s" & i, _
To:="s" & i
Next i
End With
That will cause each document to be sent to the printer as a separate print
job so that the duplexing should work correctly.

Signature
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
> We have a merge document that used to start each new record on an odd
> numbered page. We have recently upgraded from office 2000 to office 2007.
[quoted text clipped - 5 lines]
>
> Kevin Bilbee
Kevin Bilbee - 27 Apr 2007 18:28 GMT
Thank you for this suggestion. Our department running the merge has delete
their recent data run and fixed the document manually this week. When they
get new data they are going to save the merged document for me to play with.
Kevin Bilbee
> Execute the mail merge to a new document and then use the
> following macro to send that document to the printer:
[quoted text clipped - 18 lines]
>>
>> Kevin Bilbee