I want to help Outlook 2010 thread my emails. My understanding is that it bases the conversation view off of the conversationTopic property of the MailItem. I wrote the following method and created a rule so it would trigger on email subjects like "Order# 345 - Reply from vendor" and "Order # 345 - Reply from customer" and put them in the same thread. Unfortunately the conversationTopic is a read only property.

Does anyone know a way around this or perhaps a better way of accomplishing the same task? Thanks!

Sub ModifyConversationTopic(Item As Outlook.MailItem)
    Dim regex As RegExp
    Dim newMailItem As Outlook.MailItem
    newMailItem = Item.Copy
    Set regex = New RegExp
    regex.IgnoreCase = False
    regex.Global = True
    regex.Pattern = "(Order# [0-9]+) .*"
    If regex.Test(newMailItem.Subject) Then
        Dim matches As MatchCollection
        Set matches = regex.Execute(newMailItem.Subject)
        Set topic = matches.Item(0)
        MsgBox ("OH YEAH" + topic)
        newMailItem.ConversationTopic = topic
        newMailItem.Save
    End If
End Sub
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