Before the N900 was released I am pretty certain I heard/read that conversations with one contact would appear in the same thread. However, this is not the case on my device. SMS and instant messages from different accounts are each kept in a separate thread. I was under impression I would see SMS, skype IM, yahoo IM, etc from the same contact in the same thread.

Is there an option to have them merged (can't find that) or was the marketing speak false or did I misunderstand the marketing speak?