That would be better in Outlook 2010, I think. For earlier versions, I believe that you need this code, which is quoted directly from http://www.outlookcode.com/codedetail.aspx?id=1714
Function FindParentMessage(msg As Outlook.MailItem) _
As Outlook.MailItem
Dim strFind As String
Dim strIndex As String
Dim fld As Outlook.MAPIFolder
Dim itms As Outlook.Items
Dim itm As Outlook.MailItem
On Error Resume Next
strIndex = Left(msg.ConversationIndex, _
Len(msg.ConversationIndex) - 10)
Set fld = Application.Session.GetDefaultFolder(olFolderInbox)
strFind = "[ConversationTopic] = " & _
Chr(34) & msg.ConversationTopic & Chr(34)
Set itms = fld.Items.Restrict(strFind)
Debug.Print itms.Count
For Each itm In itms
If itm.ConversationIndex = strIndex Then
Debug.Print itm.To
Set FindParentMessage = itm
Exit For
End If
Next
Set fld = Nothing
Set itms = Nothing
Set itm = Nothing
End Function
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