VB Script to alert when message sent without attachment in Outlook

Chris_Bottomely provided the following code to paste into ThisOutlookSession in VBA to detect the absence of an attachment in a message when the word attach, attachment etc.. was mentioned in the message. It works great on Outlook 2010, but not on Outlook 2007. Can anyone suggest why?

Private Sub Application_ItemSend(ByVal Item As Object, Cancel As Boolean)

    If InStr(Item.Body, "attach") > 0 Then
        If Item.Attachments.Count < 1 Then
            If MsgBox("The message body mentions an attachment, but none found." & Chr(13) & Chr(10) & "Send anyway?", vbYesNo + vbDefaultButton2 + vbExclamation, "Attachment Missing") = vbNo Then
                Cancel = True
                Item.Move Application.Session.GetDefaultFolder(olFolderDrafts)
            End If
        End If
    End If

End Sub

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snooflehammerAsked:
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David LeeCommented:
The code will work in any version of Outlook.  Are macros enabled in Outlook 2007?

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snooflehammerAuthor Commented:
Macros are enabled. I've tried on two installations of Outlook 2007 and nothing happens when a message without an attachment is sent containing the key word. Three Outlook 2010 PCs work fine.
David LeeCommented:
Do you know if the code is even firing?  Set a breakpoint in the code and see if it's running at all.  My guess is that it's not.
snooflehammerAuthor Commented:
Sorry, but I'm no coder. How do I set a break point?
snooflehammerAuthor Commented:
Macros were not disabled, in fact, contrary to my previous comment.

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