How can I modify conversationTopic so emails with different subjects are put in the same thread?

Question

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 MailIte

Answer 1

You will need to construct the PR_CONVERSATION_INDEX property the right way - see http://msdn.microsoft.com/en-us/library/office/cc765583.aspx. The property can be set either using MailItem.PropertyAccessor or RDOMail.Fields[] in Redemption.