We use Outlook 2007 and Microsoft Exchange 2007 and have users all over the world. The issue we need to resolve in some way, shape or form is that, from time to time, someone starts a "conversation" and replies show up as a different conversation. Said another way, I send an email to many people in the company entitled "business forecast" - and in the conversation view I have 2 conversations by that name - my original, and their responses. The "related messages" function fails to link them, even though every response has the original in it. The does not happen all the time - it is the exception, not the rule. Where should we look to trouble shoot this?